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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:
GertrudePerkinsPaperyThing · 09/01/2026 14:33

As others have said, I would take a massive step away from all of it.

If she tries to talk to you about it, tell her to stop, and that you don’t want to hear it.

Time to rethink being so “close knit” with all the family I think. Gives the false impression that her problems are yours, and allows both her and your Mum to overstep your boundaries (your Mum by trying to get you to find out information).

I agree with those saying being autistic can make you more emotional and more sensitive, especially for women and girls, and also makes you more easy to manipulate.

aerisgainsborough · 09/01/2026 14:33

ohyesido · 09/01/2026 14:26

It sounds like you want to complain about B and have everyone agree that she’s a bad sister. Why would you feel sick and stressed about her affair?

She’s not a bad sister. Not a particularly good wife, but that’s by the by. I’m increasingly frustrated by her behaviour and perhaps I am mistaken in thinking that forums are a place to vent. I love her and I want her to be happy but I don’t want to hear about dick pics and the apps anymore. She’s not really been there for me for a long time but just expects me to be there for her. I’m her sister and I’ll try to be there for her as much as I can but so much of this has been against my will.

OP posts:
itsnotagameshow · 09/01/2026 14:35

In terms of you feeling you have to help for her mental health, I would work on pointing her towards services which can help (counselling etc), saying that you are not the right person to support her in this, it needs to be someone professional.

Think about it like this: despite all your efforts, and all that it costs you emotionally, nothing is improved for your sister. And you can't pour from an empty cup for your own family.

Look after yourself.

itsnotagameshow · 09/01/2026 14:36

I would also think about telling her how much what she is telling you/ involving you affects you, which is why you are putting boundaries in place now you are all adults. Families are weird, we can all be forced into roles which don't suit us, but we don't have to stay there.

WallaceinAnderland · 09/01/2026 14:37

The thing is OP, you are doing this to yourself.

You are so stressed but you are not doing anything to help yourself.

Because of your training and your profession, you know that there are tools to use. You know that you need to change your own behaviour.

You should focus on improving yourself, setting healthy boundaries, etc. All this stuff you already know so why aren't you doing it?

FollowSpot · 09/01/2026 14:38

OP I think you have to tell your sister that you do not want to hear about her marriage or dating life. Not at all.

Tell your whole family that you will not in future agree to keep any secrets and they must not ask you.

Tell your family that you have stopped talking to your sister about her marriage / dating and will not enter into conversations with any of them about it either.

They are all just stoking their own drama by all this talk and discussion. Step right out of it.

There is nothing you can do to help them so there is no point in knowing about it.

aerisgainsborough · 09/01/2026 14:38

Poppingby · 09/01/2026 13:41

I have to say that I feel sorry for B. You've really painted it like you and the rest of the family don't like her and your feelings about her life are more important than hers. She hasn't hurt you. She sounds a bit out of control but I would just let her get on with it because none of it affects you really, when it comes down to it. You have a nice husband and children and plenty to think about. Focus on that. Tell your parents to stop asking you about it. Refuse to discuss it with them. Talk to her about it if you and she both want to, otherwise focus on other things, because yes this is all annoying drama but it's not your drama.

My parents act like they’re walking on eggshells around her and expect me to fill them in on stuff. I’m the only one asking her if she’s ok and I really do want her to be happy. I have a lot of time for her but I can’t enable her behaviour like when we were teenagers and she needs to stop trying to make me.

OP posts:
AnnieLummox · 09/01/2026 14:38

I’m trying to put some distance between me and her problems because we all get a bit enmeshed at times

A bit?!

This is your sister’s life. Your sister’s marriage. Yet everything on the thread is about YOU. Right down to the subject line about how your sister “ruined Christmas” and how YOU’RE really stressed. Couldn’t think about anything else, being sick, making sure your parents turned on HER for causing YOU stress - it’s all about you. You’ve reduced your sister to the supporting role in her own story, while you’ve somehow become the star.

You judge her marriage, her lifestyle, even her hobbies. You judged her for the affair, her husband for forgiving her, yet still can’t cope when she does the same again, wailing that she’s “not the person who thought she was” - even though she’s exactly the person you knew she was! And you wonder why she has self-esteem issues?

You have a busy life of your own to manage. You don’t need to take on your sister’s as well - and you can’t blame her for you getting stressed over it. You have choices.

Look up Main Character Syndrome - and ask yourself why Julia Roberts or Nicole Kidman never play the confidante sister.

Ivyy · 09/01/2026 14:39

If you try to hold a boundary and your sister ignores it / insists on letting it all out to you, then I’d start to avoid seeing her on your own op. If she then tries to “get things off her chest” by phone, don’t answer or respond to messages. Tell your parents you can’t keep acting as family go between, it sounds like they’ve parentified you as the eldest and there’s also a level of unhealthy enmeshment.

I’m ND and I totally get it, all this would make me feel sick too. I think NT people would find it just as stressful though surely? Either way, you have to put your own well-being and mental health first, if you try explaining all this to your sister and she still doesn’t get it and continues to be selfish, then I’d honestly avoid seeing her, at least in the short term. Please start putting yourself first.

The reference to the guy with the big hands is clearly sexual / kink related, but I’d also be worried about her meeting this man now. All you can do is warn her to be sensible if she insists on meeting him, to do it in a public place and not go back to his place. Ultimately though she’s an adult and makes her own choices, you are not responsible for her potentially poor judgement and decisions. If your sister and parents don’t understand how negatively this is effecting you then there’s not a lot you can do, other than putting boundaries in place and not seeing your sister alone in the short term. Just make excuses for now if being honest feels too much at the moment, but please start putting your needs first right now Flowers

aerisgainsborough · 09/01/2026 14:41

mumofoneAloneandwell · 09/01/2026 13:48

Yeah this

b isn’t blameless but it sounds to me like she’s the family scapegoat and doesn’t really have anyone.

yabu imo - leave her to it and maybe try loving her like you do your youngest sister 😬

I love them both and always will, which is why I’m so concerned for her. However, I can’t help but feel a bit resentful when she throws a grenade into her own life and then expects me to be like “Yassss Queen, you do you” and let her use my house as a therapists office and somewhere to go when she doesn’t want to be around her husband/potential ex husband anymore.

OP posts:
ElegantFowl · 09/01/2026 14:42

How tedious; like a bad soap opera. I’d put some distance between you and leave her to it. I’d loathe to be this entrenched in my family’s private lives.

Keroppi · 09/01/2026 14:48

Yes but you need to stop asking her if she's okay or inviting the conversation in. You need a cooling off period from her!

And you need to rebuff your parents with: "I'm sorry, I don't know anything about it anymore, you'll have to ask her yourself. What are your weekend plans?"

She's obvs a volatile character so you are
You work in mental health, you need to reread the Drama triangle as you are in the rescuer and enabler role. How would you advice boundaries with someone you're supporting at work? Time to Flex your communication muscles !!!

If she nips around just be busy on your laptop and CONSTANTLY talk about how swamped you are, don't have time for anything etc. Offer her a tea and say she can't stay long as you're nipping out soon
If she starts talking just say awww sounds difficult. Anyway....

deadbobaplace · 09/01/2026 14:49

ND person here who has also had to deal with sibling drama.

Everyone here who is saying it's your fault for not setting boundaries? People like B ignore boundaries. I have said so, so many times 'I can't deal with talking about this right now, please can you stop' and they do. not. care.

If you block them that causes even more drama and you get everyone else on your back because they don't want to deal with the fallout.

So what you need to do is set your boundaries internally. Let the craziness carry on happening outside you (it's going to anyway) while you detach emotionally. You are not responsible for B's behaviour, you can't do anything to change it, and it's not your job to protect her from it. You can judge the hell out of her if you want, just don't bring that to your interactions with her. Think of her as a client or a patient. Lots of 'yeah, OK' and 'that must be hard for you', but your actual feelings stay with the people who are able to reciprocate them.

aerisgainsborough · 09/01/2026 14:49

AnnieLummox · 09/01/2026 14:38

I’m trying to put some distance between me and her problems because we all get a bit enmeshed at times

A bit?!

This is your sister’s life. Your sister’s marriage. Yet everything on the thread is about YOU. Right down to the subject line about how your sister “ruined Christmas” and how YOU’RE really stressed. Couldn’t think about anything else, being sick, making sure your parents turned on HER for causing YOU stress - it’s all about you. You’ve reduced your sister to the supporting role in her own story, while you’ve somehow become the star.

You judge her marriage, her lifestyle, even her hobbies. You judged her for the affair, her husband for forgiving her, yet still can’t cope when she does the same again, wailing that she’s “not the person who thought she was” - even though she’s exactly the person you knew she was! And you wonder why she has self-esteem issues?

You have a busy life of your own to manage. You don’t need to take on your sister’s as well - and you can’t blame her for you getting stressed over it. You have choices.

Look up Main Character Syndrome - and ask yourself why Julia Roberts or Nicole Kidman never play the confidante sister.

Hang on, I believe I mention in my initial post that I was the only one who knew outside of my sister and her husband at that point. Nobody saw me struggle during Christmas week because I masked my absolute arse off while people were around. When it got too much, I told my husband what was happening because the weight of the secret that she made me keep was upsetting me so much.

OP posts:
aerisgainsborough · 09/01/2026 14:50

CorvusPurpureus · 09/01/2026 14:08

If you were B, I'd be advising you to focus on extricating yourself from your miserable marriage (it sounds like they're doing that, & amicably, which is great). Then staying away from dating for a bit (she's obviously got appalling judgement in this area & needs to work on her self esteem, rather than throwing herself at an attached colleague barely out of his teens, followed by Mr Kinky Strangler Hands).

But...you are NOT B. She's a grown woman. She doesn't need her big sister's input into her private life. In fact, it's probably doing her no favours at all - she needs to start seeing herself as an autonomous adult, not the ditzy troublesome middle sister like she's still a teenager.

You should back right off. Tell the rest of the family you aren't getting involved & they should ask her directly if they want to know what's going on. Tell B you don't agree with some of the stuff she's doing, you'd rather not hear about it, but you're there for a coffee.

Basically - not your 🎪 not your 🐒 🐒.

I’m not pushing my way in, I’ve only ever just been there when she needs me.

OP posts:
CremeCarmel · 09/01/2026 14:57

As an eldest daughter I totally understand why you feel you need to be so involved in your sister’s life. Everyone has always leaned on you and you don’t know any different than to sort everyone else’s problems.

My advice is that you should free yourself from the enmeshment and enjoy your life.

I have a similar situation. I would be so much happier if I could take the advice I have just doled out to you.

RawBloomers · 09/01/2026 14:57

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

As part of working in mental health you've surely learnt skills to compartmentalize and put boundaries in place? You need to apply these skills to your sister.

You aren't being taken advantage of because you work in mental health. You are being taken advantage of because you are letting people (your sister!) take advantage. Even if you didn't work in mental health she'd likely be coming to you because you are letting her off load and she cares more about getting that relief for herself than she does about you having a happy life. Tell her no.

aerisgainsborough · 09/01/2026 14:58

aerisgainsborough · 09/01/2026 14:50

I’m not pushing my way in, I’ve only ever just been there when she needs me.

Totally get what you’re saying though. She needs to maybe see the consequences of her actions and stop trying to filter it through me or others.

OP posts:
AnnieLummox · 09/01/2026 14:58

aerisgainsborough · 09/01/2026 14:49

Hang on, I believe I mention in my initial post that I was the only one who knew outside of my sister and her husband at that point. Nobody saw me struggle during Christmas week because I masked my absolute arse off while people were around. When it got too much, I told my husband what was happening because the weight of the secret that she made me keep was upsetting me so much.

And then your parents went straight into “How could you put all this on your poor sister?” Did they even ask if B was alright, given her marriage has broken down? Or was it all about your stress?

newyorker74 · 09/01/2026 14:59

I wouldn't normally suggest this but, as he appears to be supportive, is there anything your husband can do to support you put some stronger boundaries in place whilst you rebalance your feelings here? Maybe he can pick up the phone to your sister and mum and say you are relaxing in a bath and then 'forget' to give you the message? Or say you are dealing with the kids when they pop around? It's probably not a long term plan but I know I would do this for my husband if required. Sometimes it's easier for someone outside the immediate family to be the bad guy (not that I think you are bad at all - you are actually too good!) but I can see how your family might interprete your separation as making you bad in some way.

aerisgainsborough · 09/01/2026 15:00

RawBloomers · 09/01/2026 14:57

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

As part of working in mental health you've surely learnt skills to compartmentalize and put boundaries in place? You need to apply these skills to your sister.

You aren't being taken advantage of because you work in mental health. You are being taken advantage of because you are letting people (your sister!) take advantage. Even if you didn't work in mental health she'd likely be coming to you because you are letting her off load and she cares more about getting that relief for herself than she does about you having a happy life. Tell her no.

Having boundaries and contracting with a stranger is an essential skill but maybe easier when you don’t know the person and you’re going into the relationship with those boundaries already in place. Appreciate what you’re saying though. I’m a bit of a doormat :(

OP posts:
AnnieLummox · 09/01/2026 15:01

I have a lot of time for her but I can’t enable her behaviour like when we were teenagers and she needs to stop trying to make me.

And you need to stop letting her. Take some control over YOUR response.

Farticus101 · 09/01/2026 15:05

Frenchfemme · 09/01/2026 13:44

Another eldest child here. Very kindly, you are not responsible for your sister. Her problems are not yours to carry. When she tries to draw you in, just say you are no longer taking part in the drama and are limiting contact for your own wellbeing. Repeat as necessary. When your family demand details or try to get you to find them out, just tell them that it’s not your issue and to ask your sister. If you are firm and consistent they should eventually get the message and leave you out of it. It won’t be easy, but no one else has a right to your time and energy.

100% this.

Not your drama. You can't control what she does and she may continue to make awful decisions but she is in her 30s and there is nothing you can do except not being dragged along with it.

Redpeach · 09/01/2026 15:06

I struggle to see how christmas was ruined. Many families have dramas but still enjoy christmas

Flickaflock · 09/01/2026 15:10

aerisgainsborough · 09/01/2026 14:22

Also I was quite overstimulated all of the Christmas week and the week either side because there were people coming round, Christmas dinner to plan and cook for 10 people, social family occasions to attend, neurodivergent/disabled kids to tend to and make sure they weren’t getting overstimulated. Supporting my mum through her sudden redundancy, parts of my dissertation to write, clients to see. I’m already going into all this at quite a low ebb so yes, it affected me greatly. The being made to keep it a secret part was what I struggled with the most.

It really doesn’t sound like she was responsible for your Christmas being ‘ruined’. When I saw the title, I’d assumed that she and husband were with you for Christmas, and the affair was exposed over Christmas dinner or something of that sort.

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