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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Sister ruined Christmas with stupid affair drama - AIBU to be really stressed?

243 replies

aerisgainsborough · 09/01/2026 13:32

It’s a long one, grab a brew and a biscuit.

I’m 36, sister B is 33, sister C is 31. All married, I have 3 children, we’re close knit, live within 5 miles of each other and do stuff with each other and our parents all the time. Middle sis has always had issues with self-esteem and either hates herself or loves herself. Has always been impulsive and attention-seeking (my youngest sis and I think she may have BPD).

B’s husband is a bit of a wet lettuce and very surface-level, is a bit ignorant and only speaks to my kids to tell them off in a really patronising voice.B He has “not made his mind up” on whether or not to start a family so B is kind of stuck in limbo on that and they won’t discuss it. She tries to let on that she doesn’t want children, but it directly contradicts what’s she’s said before and she flip flops constantly. They have very few commitments, a cat and a weekly board game club, and sit playing online games all weekend and that’s about it but reckon they live busy lives.

However, B cheated on him 10-ish years ago and he forgave her, which made us all lose respect for both B and for him because she really was horrible to him. He then proposed and they’ve been married for 5 years. He struggles a lot with anxiety etc and she says she feels more like his carer, but we’ve never seen any behaviour to support this so just generally have to take her word for it.

Recently B started a new job (she changes jobs nearly every year) and has got friendly with a male co-worker who is 10 years younger and they’ve started up a fling, despite them both being married. She “left” her husband almost immediately and declared her love for him. He strung her along for weeks, saying he couldn’t leave his girlfriend yet, going through phases of constant messaging and then ghosting her. Eventually she confronted this lad and said she loves him and he’s told her he regrets it all and nothing can happen. I was sworn to secrecy during all of this and nobody else knew but me, which was horrible and during Christmas week so I spent the whole Christmas period hosting the rest of the family while B and her husband went and played happy families with his side. I’m autistic and had a very intense internal struggle with all this. I was crying, feeling sick, unable to think about anything else. I was trying to cope with everything changing, her betrayal and not being the person I thought she was, them already being split up but not telling anyone, When it finally all came out and she told everyone, they were all angry at her for putting me in that position. It’s all everyone has been able to talk about since and my mum keeps trying to get me to find things out. I’m the eldest default child who gets leaned on by everyone and I’m just so tired.

So B is now just living with her husband as housemates and helping each other set up dating profiles. She is meeting up with a 40-odd year old she met on a kink app and during a phone call he told her that he had massive hands and could choke the life out of her if he wanted to. I’m sitting there listening as she tells me she’s meeting up with him at his flat in Manchester and I am now picturing her being chopped up and dumped in a bin. I’m trying to put some distance between me and her problems because we all get a bit enmeshed at times and it’s not good for my mental health but I am worried sick that something will happen to her.

My parents fully believe that B and husband will get back together and don’t know about B being “on the apps”. I’m sick of them asking about it and just don’t know what to do about it all. Thank you, if you’ve read this far.

OP posts:
aerisgainsborough · 09/01/2026 19:02

beAsensible1 · 09/01/2026 15:15

why were your parents so angry at B for putting under all that stress if they’re keeping it up by asking you. Villainising her for leaning on you and then doing the same.

I assume B is confiding in you in sisterly way as you say you are close. If you do not wish to be confided in by her then you should say. If she keeps going hang up the phone.

BPD is quite a big thing to have and manage has you all spoken to her about it properly? Or were you being flippant?

it sounds like her marriage is all over the e place but they’re at least talking to each other about and not lying. So that’s better than nothing, can you ask your other sister to keep and eye if you are worried and take a step back from everyone for a bit.

It’s been brought up seriously a few times and she copped to it but never sought a diagnosis. She has these patterns of behaviour and cycles of it and I believe she feels trapped by it.

OP posts:
aerisgainsborough · 09/01/2026 19:06

Clarehandaust · 09/01/2026 15:17

I think you do want to know what’s going on in your sister’s life when she’s chatting to somebody who has told her that he could choke her to death
I can’t believe some of you a lot would step back frankly that’s just awful behaviour

I can’t switch off the big-sister feelings and I need to try and find a balance. But this I can’t ignore and I hope it’s her going for a bit of shock value

OP posts:
aerisgainsborough · 09/01/2026 19:09

MrsCompayson · 09/01/2026 15:17

I don't understand most of these responses to be honest. You don't ask for this drama in your life, your sister is trying to drag you into her drama to validate her awful behaviour.

1.You have to put in firm boundaries. If they ignore them, you have to go no contact at least for a while.

  1. Only you know the dynamics of your family, but is seems as though your parents are quite happy for you to do the parenting, so they can avoid the backlash. I wonder how it was for you all growing up? Was your sister a handful? Did mum and Dad always let her have her own way? Just a thought, try to explore the dynamics, see if you can make sense of it?

I probably have no right to say this as I don't have any first hand experience of ND myself but I just wanted to say that you don't need to worry about getting things wrong/judging the situation badly, just that you are feeling a certain way and recognising that. What I am trying to say is it doesn't make your opinion crazy, irrelevant and less valuable. Hope I haven't offended by saying that.

No offence at all and thank you. My reaction to it has shocked me and I’m trying to dig into what is underneath it all. ND overwhelm a big factor and also a big bereavement this year that required me to give my family a lot of support. I think I’m just utterly burned out.

OP posts:
independentfriend · 09/01/2026 19:11

Standard kink advice would be:

  • Try to talk to other people who know the person you're planning to meet in advance
  • Meet somewhere public - coffee shop / pub and go from there.
  • Seriously consider arranging to do kink stuff with a new person at a kink club. Not everybody into kink wants to do it with an audience but there are safety advantages ie. in a kink club if you start shouting "red" you will quickly attract attention from staff / volunteers which is useful if the person you're doing stuff with is behaving badly and you want to get away. It's also useful if you want to do tying people up in ways that are hard to escape from - the risk is of the person doing the tying up suddenly becoming unwell and the tied up person being stuck. And useful for other things too but you get the idea.
  • Hotels are safer than people's houses - they have reception desks / CCTV and are a good choice when you don't know someone well.
  • Having a safe call - someone who will come and find you / phone the police to report you missing if they don't hear from you by an agreed time.

Predatory people may try to isolate a new person from the kink community in the hopes they don't get to hear warnings about them or good advice on negotiating play.

Kinksters also tend to take a much more conservative line on choking than you might expect and are a bit horrified at it becoming more mainstream. It's extremely dangerous and lots of us wouldn't dream of doing it. It is redflaggy to have it come up in early discussions. There's no way to make it safe (some people do it anyway with an awareness of those risks).

So, you could sensibly encourage your sister to look up and go to local munches (coffee / pub social meets for kinky people). That would give her other more appropriate people to talk to about kinky.

Standard boundaries around discussing sex between siblings would say it'd be better for you both if she found someone else to be her safe call person.

Autism is definitely worth looking at given you have it. Sometimes there's both autism and a BPD/EUPD element and you need to know about the autism to adapt the treatment for the personality disorder.

aerisgainsborough · 09/01/2026 19:11

Bloozie · 09/01/2026 15:17

Ah bless you... You need to be really clear with your sister and your parents that you don't have the bandwidth to deal with this right now, and they both need to dial it back.

It's easier with your parents because you can simply say, 'My autistic brain cannot cope with having to dive into this every time we speak. I don't agree with what B has done or is doing, but it's her life to lead and we have to trust her to get on with it. I'm not inserting myself into any of the drama, and I'd really like it if we can talk about something else as us constantly talking about whether she'll get back with her husband won't change the outcome, I don't know any more than you do and it's frying my brain."

A more delicate approach with your sister is probably needed, as she feels she needs your support and you have no energy left to give. Maybe something like, "B, I love you but this is all so far outside of my sphere of experience that I'm just not the right person to advise you on dating etiquette, or kink, or any of it. And you know I felt really uncomfortable lying at Christmas. If I'm completely honest, it's all starting to make me feel quite anxious - which is perhaps a me problem, a feature of my autism, but either way, I love you and I support you but I can't deal with being so immersed in your love life right now. I don't know what to do with much of the information you're giving me, I don't know how to play the apps and the dating game - and that feeling of genuinely not knowing but wanting to support you is stressful for me. I think (C/her best friend) might be better placed - or have you thought about joining a community like Mumsnet?"

You’ve hit the nail on the head, this is exactly what I’m feeling. I’ve been trying to say this to everyone but it often falls on deaf ears. I find conflict and standing up for myself difficult and I just want a quiet life with my husband and kids. I think I’m going to have to say it louder and stand firm.

OP posts:
aerisgainsborough · 09/01/2026 19:13

WilfredsPies · 09/01/2026 15:22

‘Heavy is the crown of the eldest daughter’. Have you read that poem? I think you might find it hits home a bit.

I cannot imagine being anything other than frantic with worry if one of my younger sisters told me they were off to the flat of an internet stranger who was looking forward to choking her. Especially if she had a history of unwise decisions. You’re damned if you do say anything and damned if you don’t, especially if she finds herself in a situation she can’t get out of. It’s too much pressure, even without being neurodiverse.

I think that the next time she starts to tell you something, you have to interrupt her and tell her to stop. Tell her that you’re not her therapist and you’re not keeping any secrets for her, especially when she’s doing really stupid stuff. Tell her that you love her but you just can’t do it anymore because it’s making you ill. And then speak to your parents. Tell them she’s on dating sites, she’s talking about going off to meet complete strangers and that they need to talk to her because you cannot deal with this anymore. She is their daughter, not yours, and you can’t sleep at night for worrying about being responsible for everyone, from her safety and keeping her secrets, to them being kept updated with what’s going on. It’s too much and you’ve hit your limit. If anyone starts to argue or justify or says anything other than ‘ ok, that’s fair’ then end the conversation immediately. Don’t even let them finish their conversation. Either hang up the phone or walk out the door. They need to see that you’re serious.

Yes, this is correct and it’s just horrible. Im sick of being looped in as the third parent because they don’t know how to deal with her, never have, and she seems to only listen to me.

OP posts:
aerisgainsborough · 09/01/2026 19:17

InMyOodie · 09/01/2026 15:22

You really don't like your sister B. She must know that. I feel sorry for her. You are so sneering about her and how she 'hasn't matured beyond her 20s'. Maybe be less smug and give her some space.

I don’t always like her, but I do love her. I’m
not smug, I just want to protect my peace and not be the default bomb diffuser for every single thing that goes wrong. She’s done some shitty things and I don’t have to agree in order to help her. It’s not easy being in this position at all but I know she’s not a bad person.

OP posts:
aerisgainsborough · 09/01/2026 19:19

Givemeausernamepls · 09/01/2026 15:24

your sister sounds really unhappy and it sounds like you, your sister and mum are constantly talking about her and judging her.

if you don’t want to be involved that’s fair enough but that extends to not gossiping etc. just grey rock with oh that sounds really hard, or I’m sure you’ll be able to figure it out.

B is actually saying how happy she is every time I see her or have any communication with her. She says she has never felt so free and is looking forward to sowing her wild oats. It’s really hard to get a read on her mental state when this is what she says to me.

OP posts:
Epidote · 09/01/2026 19:20

Ignore all of them and mind your business, no because you are been nosey or interfering, just because ignoring them will help you with the stress. Grey rock them, all of them. They can cheat, dance, become poliamorouse, or smell with pride their own farts. Nothing to do with you.
If you mum ask, tell her that what your sister does it is none of your business. If you sister want to talk tell her you don't want to know, that she is an adult and you are minding your own business. Rinse a repeat. Let them clear that you don't want that drama in your life.

aerisgainsborough · 09/01/2026 19:21

SmileyMoonset · 09/01/2026 15:39

I’d be pretty cross with my sister however this is not your circus or your monkeys. She’s an adult and entirely responsible for her own behaviour and actions.

Drop the rope:

I love you but I don’t want to discuss your marriage or your dating or your sex life. If you don’t stop I will have to leave/hang up/ask you to leave.

I love you Mum but I don’t want to discuss sister’s marriage or life at all. If you have questions ask her.

You absolutely have the power to reduce your own stress here.

I know and I’m going to try. Thank you

OP posts:
ThisTaupeZebra · 09/01/2026 19:23

OP, I know that this isn't really the point of your thread, but as somebody who is also the eldest of three girls, if I were to tell my sisters that I was meeting up with somebody I had met on a kink app, they would tell our parents, as punishment for me telling them that I was on a kink app.

aerisgainsborough · 09/01/2026 19:26

TwoTuesday · 09/01/2026 15:41

She ruined Christmas did she? I bet her Christmas was worse!
There is no need to for you to "take on" the stress of her personal life. If you really don't want to hear it, say so, but it seems you're getting far too invested - say no to your parents when they ask you to dish the dirt/ parent your sister on their behalf.
There was no need to sit through facetime with her and her husband either. Her husband is not your concern, he knows what she is like by now.
It's not all about you.
You seem to like feeling superior though, so maybe the stress of hearing all about her disasters has a payoff, if it does, you can't really start complaining about it now.

I don’t feel in any way superior. Me and her are just wired differently. She went to Cornwall for Christmas and had a whale of a time. I spent mine trying to contain this bullshit and keep it off my mum’s radar as she spent her first Christmas without her brother/our uncle. I wonder every day what I did to deserve my beautiful children and husband and have very intense and regular imposter syndrome. I hope that you feel superior for your comment.

OP posts:
LBFseBrom · 09/01/2026 19:29

I am sorry your sister has put you in this awful situation, especially given your autism. It's just not fair, neither is your mother wanting you to find out information, she of all people should know better.

What I would do in your position is tell your sister how unfair she is to burden you with her confidences and refuse to listen to any more. I know that won't be easy but you have to consider your own mental state.

I find the 'big hands' and choking scenario quite alarming, well, very alarming but trust your sis is not so stupid as to meet the guy.

Good luck.

aerisgainsborough · 09/01/2026 19:31

FerriswheelsKissesandLilacs · 09/01/2026 15:41

I recognise these patterns from my SIL who I think may have BPD or vulnerable NPD, or maybe both. But that's being unkind to people with PDs because everyone I know with diagnoses behaves better than her.

She creates chaotic drama in her own life, then pulls me into the drama and begs for me to help her. During the peak of the chaos, this will be extremely intense- multiple phone calls all day sometimes going on for an hour or more where she'll talk in circles. Usually there will be lots of crying and self-flagellation, saying she's so stupid and has made a massive mistake, and if I don't immediately contradict her she'll accuse me of agreeing that she's stupid.

This is the point where she'll threaten to hurt herself and have herself admitted to hospital, send vague messages implying intent to unalive herself or that she's in a dangerous situation, and then switch her phone off and go out of contact for several hours. She's always absolutely fine.

Bear in mind that only half of what she's said is true and she's contradicted herself multiple times so I no longer have a clear picture of what is going on. If I suggest that she's not being truthful, she'll get very angry and send barrages of abuse.

Then I'll try to pull away from the situation a bit and usually that will result in a full on eruption and might mean nasty messages being sent to my friends and relatives, rumours being spread about me etc. For other people, such as ex-partners, this is the stage where she'll call the police and social services and make false allegations.

Then we go no contact for maybe a year or two and she spins stories to all the family- who don't have the full picture about what she does- that we've abandoned her, and usually, one way or another, we end up being guilted into re-introducing contact. No good can come of it.

She doesn't care about anyone. She will only prioritise herself. Look now at how she's treated her husband and yet only cares about ensnaring the next man. The oversharing about sexual details you didn't want to know is also exactly what my SIL does. It's all about what serves her needs.

I’m so sorry you’re going through that, I see a lot of similarities and it sounds so intense and inescapable. I hope you find some peace through all that and I’m going to try and find some of my own too.

OP posts:
RawBloomers · 09/01/2026 19:32

aerisgainsborough · 09/01/2026 18:46

I feel seen by you, you get it. Boundaries ignored equals the same old shitty cycle and my inner people pleaser/empath/helper jumps out time and time again.

This is the wrong way to think about boundaries. Boundaries aren't requests you make that other people stick to. That's just the other person acting well. You don't need to set boundaries with someone who will follow your requests.

Boundaries are things that you stick to. You don't need your sister to stop trying to tell you stuff (though it would be lovely if she did). You need to stop listening to her. That's you having a boundary. Not saying "Please don't." when it happens, but saying "Sorry, I have to go."

Stucknstoopit · 09/01/2026 19:33

I’m neurodivergent and I understand the tendency to get pulled into other people’s drama and to end up with it absorbing you, taking away your brain space and making you feel anxious .
I’d always end up paying a far higher price than anyone who’s actually involved.

you need to start telling everyone you don’t want to be involved, you don’t want your sister to tell you stuff and you don’t want other people grilling you for information.
Don’t need to go into detail, just stick to your guns and spend less time with them if they keep trying to pull you in or interrogate you.

aerisgainsborough · 09/01/2026 19:35

outerspacepotato · 09/01/2026 15:57

I disagree. Boundaries are easy.

No.

What are you afraid will happen if you shut her down?

Setting yourself on fire to keep your sister and her husband warm is extremely unhealthy. If you have difficulty saying no to things that harm you, you need therapy yourself. You can't fix her. You also can't act as her therapist or sounding board or any of that.

Think of it this way. When you participate in this toxicity, you are taking away a healthy you from your own husband and children.

I don’t want her to feel like she’s on her own and no-one cares. I don’t want her to put herself in unsafe situations because she’s not thinking clearly. I wish she could have an easier time of it all.

OP posts:
aerisgainsborough · 09/01/2026 19:38

godmum56 · 09/01/2026 15:58

"I work in mental health and it means I get taken advantage of sometimes because I’m kind and want to help."

If you don't develop switch off mechanisms, you won't make it to retirement. Say clearly and firmly "I will not listen to this" and mean it. You work in mental health, you know that the only person who can make a difference to your sister is your sister. If you are any kind of competent clinician, you know what to do, you just have to do it. So yeah YABU.
edit: You learned stuff from your sister against your will? Did she have a gun or something?

Edited

We can’t all be bulletproof just because we work in mental health. Fucked up family dynamics are there for a lot of people, I don’t think I’m in the minority there. You’re right though, the time has come for me to make some decisions.

OP posts:
aerisgainsborough · 09/01/2026 19:41

Uhghg · 09/01/2026 16:33

It’s really difficult when it’s your own family members because you are of course going to feel worried for them.

But you need to physically create some distance from her.
Say you’re busy, don’t meet up or answer the phone as much.
Tell her you don’t want to hear it when she starts.

She sounds awful - having an affair twice.
But this is not your life and you do not have the mental energy to spend it on her as well as yourself, DH and kids.

I have a rule that I do not (try not) to have other people making me feel stressed out.
As a single parent my energy needs to go on myself and DC.
Life can be hard enough without adding other people’s drama to the mix.
This attitude came after years of being dragged into my parents and siblings dramas and I used to spend more time and energy on their relationships and problems than my own,

You cannot control what other people do.
If they want to act like twats and mess their own lives up then so be it.
Sometimes people need to learn the hard way.

You sound very kind and empathetic but for your own MH you need to take a step back.

Thank you. I really am just worried and can’t bear the thought of anything happening to her. It doesn’t help when none of the others will just shut tf up about it all.

OP posts:
aerisgainsborough · 09/01/2026 19:42

Boododedoop · 09/01/2026 16:34

You’re in an awful situation probably made worse for you by being autistic. I’ve no advice to give but I did want to offer you some support from afar.

Thank you :)

OP posts:
outerspacepotato · 09/01/2026 19:43

aerisgainsborough · 09/01/2026 19:35

I don’t want her to feel like she’s on her own and no-one cares. I don’t want her to put herself in unsafe situations because she’s not thinking clearly. I wish she could have an easier time of it all.

She's an adult. You can't control what she does. You're just going to have to leave her to it.

You know what you can control? Yourself. Your boundaries. Her constant telling you her private life is having serious impacts on your mental health.

Martyring yourself doesn't show her someone cares, it shows her that you're a doormat and prioritize her. She likes the drama and you enable it to your detriment.

Think of it like addiction and you're the person enabling the addict and your own family is not your priority.

If you work on mental health care, you know what a toxic family dynamic you're participating in. Time to step back and prioritize your family.

aerisgainsborough · 09/01/2026 19:48

Boododedoop · 09/01/2026 17:09

Yes. Which is why she’s posting here as a start.

You’re on this thread to deliberately pick fault with the Op and it’s really not a good look. Perhaps ask yourself why you’re doing it. Why you see a ND poster as fair game for you to bully.

Some things never change. Thank you :)

OP posts:
wrongthinker · 09/01/2026 19:50

I can understand why you're worried about your sister but you're not helping her by keeping her secrets and getting involved in her dramas.

Let her know that you're worried about her and suggest she seeks out a therapist, counsellor, or psychiatrist to discuss her situation with. Tell her that you are not able to give her that kind of support and that you need to focus on your own family. Let her know that you won't be keeping her secrets, either.

She may or may seek out some mental health help. But that's up to her. You can't force people to seek out help and support. But you can stop enabling and encouraging their destructive behaviours and dramas.

I would also stop gossiping about her with your parents, husband, and your other sister. It's not fair and it just keeps the drama alive. Stop bringing it up and if anyone brings it up with you, shut it down immediately. Focus on your own life.

aerisgainsborough · 09/01/2026 19:51

Moveoverdarlin · 09/01/2026 17:11

I’d have a lovely weekend with your own family and not give your sister or her husband a second thought. There’s no kids involved in her shit show which is good, so I wouldn’t worry. You’ve called him a wet lettuce so you don’t sound particularly loyal to your BIL so I really wouldn’t get so involved. There’s two options, they stay together or split up. Tell her to only text you this weekend if big hands gets too okey chokey.

Okey chokey made me snort. You’re right, my kids deserve a non-burned out mum that has airplane mode turned on

OP posts:
aerisgainsborough · 09/01/2026 19:54

deadbobaplace · 09/01/2026 17:41

In the unlikely event that someone manages to get a diagnosis in the UK, it'll probably be EUPD rather than BPD, since 'borderline' isn't a useful descriptive term and the acronym is easily confused with bipolar.

It's sort of academic since she's not getting a diagnosis unless things get radically worse, she's hospitalised and they can't find another label to pin on her. But since she has a number of the traits, it's not going to hurt to read up on techniques for dealing with people with BPD.

This is really interesting, thank you. I’m going to do some research, thanks for highlighting this.

OP posts: