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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:
Poppingby · 10/01/2026 15:48

You know what, I have a messed up family and am not diagnosed autistic but my daughter is as as I get older I realise I probably am.

I posted earlier in the thread saying you should focus on your own life and that your sister sounds scapegoated. I stand by what I said, but actually as the thread has developed I see that it was simplistic and not so straightforward to follow - and completely hypocritical because my reaction to stuff is much more like yours than my straightforward post would have you think. Really I react to other people's drama and find it difficult to stay away from my family's ridiculous problems. We are all (including your sis who honestly does seem scapegoated- not your fault) the product of years of family interactions and programming.

The helpful answers on your thread are actually helping me to see all this in my own life properly and I want to say thanks for starting the thread and also let you know that what can start off as someone glibly saying 'ignore the drama ' is really only a snapshot of someone's opinion that they've condensed into one post. It can develop and change as mine has. Good luck with it all. Flowers

dottiedodah · 10/01/2026 16:12

So kindly you have to distance yourself somewhat.your sis sound's immature. Unless she wants to be strangled.she should give this guy a wide berth.all you can do.is warn her and it's up to her. I would be busy for a few weeks. Maybe see friends or some days out with DH and DC

Cdu · 10/01/2026 18:00

Evaka · 09/01/2026 13:48

What a mean response. OP has said:

  • she gets dumped on as eldest sister
  • was forced into situation by sister confiding
  • is autistic and finds these dynamics hard to navigate.

That's why she's invested? They're a close family and she's affected by their behaviour.

I am so glad you have said all this. As I read various other comments I thought of my own family and would know that if I was behaving like this or any of my siblings were behaving like this. My siblings would be stressed/worried and want to help but possibly also be conflicted too.

LuluH82 · 10/01/2026 18:09

Sounds more like she has ADHD than BPD

Granddama · 10/01/2026 18:12

Not your circus, not your monkeys. You could however try to laugh at her and tell her she should write short lurid stories based on the silly stuff she's sharing with you. Try adopting a dismissive attitude , and use the statement I started with and the family might stop asking.

croydon15 · 10/01/2026 18:20

I don't like cheaters, men or women, you sound like you have enough to deal with OP. Tell your sister you're not interested in her drama and if she persists go nc.

Tuesdayschild50 · 10/01/2026 19:53

Just step back.
Tell your mum to stop asking you what is happening.
Tell your sister you no longer want this drama to take over your life so you don't want to know anything.
Your sister is a grown women if she puts herself at risk that is up to her you can't control other people.. only yourself so put yourself first from now on.

aerisgainsborough · 10/01/2026 19:59

Fridayhappiness · 10/01/2026 14:51

I agree wholeheartedly with this.

If I told you my life story you, with a sister so selfish that it negatively affected my life for 30 years, you would actually think I was making it up! Although, she wasn’t all to blame, yes, she’s a complete fuck-up, but it was my mother who told me every single problem that arose (for herself, my sister and sister’s kids) which led to me having to fix or improve things. It was exhausting but I thought we were all equally there for each other.

It took 30 years for me to see I was being used. My sister continued on her destructive path and my mum rewarded her with leaving her, her house (saying she needs it because she gave up her ‘perfectly’ good council place) and me nothing.

This was the icing on the cake for me. An opportunity to say ‘no more’!

I no longer allow people to get me involved in family drama. I’ve learnt my lesson and I wouldn’t swap the peace and quiet I now have for all the money in the world.

Edited

I see a lot of similarity and as I’ve mentioned earlier, this is the fabric of our family dynamic and all I’ve ever known. I’ve got some hard work ahead and it sounds like you’ve been able to find some peace as a result of your own hard work. Thank you for sharing, I really appreciate it.

OP posts:
aerisgainsborough · 10/01/2026 20:09

Poppingby · 10/01/2026 15:48

You know what, I have a messed up family and am not diagnosed autistic but my daughter is as as I get older I realise I probably am.

I posted earlier in the thread saying you should focus on your own life and that your sister sounds scapegoated. I stand by what I said, but actually as the thread has developed I see that it was simplistic and not so straightforward to follow - and completely hypocritical because my reaction to stuff is much more like yours than my straightforward post would have you think. Really I react to other people's drama and find it difficult to stay away from my family's ridiculous problems. We are all (including your sis who honestly does seem scapegoated- not your fault) the product of years of family interactions and programming.

The helpful answers on your thread are actually helping me to see all this in my own life properly and I want to say thanks for starting the thread and also let you know that what can start off as someone glibly saying 'ignore the drama ' is really only a snapshot of someone's opinion that they've condensed into one post. It can develop and change as mine has. Good luck with it all. Flowers

It’s a feeling of being trapped and it’s horrible. I appreciate your input and thank you for your honesty. Recognising is the first big step and that’s where I’m at right now, I’ve seen all that’s happened as a symptom and not the problem. I’m now looking up at what feels like a mountain of change that needs to happen but I’m taking ownership and I just want to be happy and at peace.

Good luck to you too, I also started my diagnosis journey when my eldest was diagnosed and after I’d felt my whole life that I was an alien. The validation of my diagnosis has allowed me to not feel like such a waste of space anymore.

OP posts:
LHP118 · 10/01/2026 21:07

I empathise. Sometimes, our families and us, as individuals, find ourselves sucked into the drama (of our siblings, parents and families...).

The thing is...we have enough to deal with in our individual daily lives and our own nuclear families.

It's time to draw and maintain your lines of engagement. My Polish friends have a fantastic saying that I use to remind myself. Not my monkey 🐒, not my circus 🎪.... I.e. not getting involved

wrongthinker · 10/01/2026 21:28

aerisgainsborough · 10/01/2026 14:43

Ok, you got me and uncovered my Machiavellian plans. Never mind that she has brought me into this herself, along with my parents and I’d do anything to go back in time and never be privy to any of the information that she offloaded onto me. Yesterday, I’ve made it clear to her that I don’t want to know any more. I’ve firmly changed the subject when my parents brought it up today. I am so conflict-averse that confrontation gives me physical sensations of pain but I’ve made a start and I’m hoping to create long-lasting change in the dynamic between me and the rest of them.

Also, if you are actually diagnosed with AuDHD, why are you trying to tear down someone else with it? Someone who clearly struggles a lot more than you do? At least with certain things. Every choice I make is for the good of my family and my children will always come first. I’m tired and done with it all. I just want to be able to live in peace.

are you coming from a place of experience with your advice, or is it purely hypothetical?

Why do you think I'm trying to 'tear you down'? You asked what I would actually do and I told you. You seem to give other people a lot of agency and speak about yourself as if you have none. I am trying to explain that what's happening in your life is a result of your choices. Stop telling yourself you are powerless.

For example, well done for telling your sister that you no longer wish to be involved in her drama. That is a choice that protects you and your family. Not telling her that and instead getting too involved and stressed out about her life is also a choice that you previously made.

are you coming from a place of experience with your advice, or is it purely hypothetical?

Well, I don't have a sister who's having an affair and telling me about her risky sex life, if that's what you mean? But I've certainly learned the hard way that if there's drama in my life, it's because I've invited it in, so now I make different choices about how I conduct my relationships. I've learned to have strong boundaries which I am steadfast about.

Peppledash · 11/01/2026 09:04

Bless you it seems to me you are trying to keep everyone happy & you are ending up stressed & miserable, is it possible your sister had a ND condition & not BPD, as ND can run in families please look after yourself you can’t pour from an empty cup. Sending hugs & things always pass & get better. xx

Justmeee22 · 11/01/2026 09:18

Your sister (B) is a selfish, attention seeking cow and is bang out of order for dumping all of this on you,, which she has most definitely done for attention btw, you can believe that.

Her husband is also a piece of work for treating your kids the way he does.

I personally think that you should stay as far away from the pair of them as possible and refuse to be drawn in for your own peace of mind, especially seeing as your own sister has so little regard for the fact that you have your own struggles with autism etc so she must know how her bs will affect you !

As for your mum and dad, like others have said, if they want info on your attention seeking sister B, they should ask her directly and not drag you into it.

Good luck ♥️

Bec1968 · 11/01/2026 19:11

surreygirly · 09/01/2026 14:04

Mind your own business

Harsh ...

Like she said she didnt ask all this .. she was told, but didnt want to know.

Stucknstoopit · 13/01/2026 02:22

Fridayhappiness · 10/01/2026 14:51

I agree wholeheartedly with this.

If I told you my life story you, with a sister so selfish that it negatively affected my life for 30 years, you would actually think I was making it up! Although, she wasn’t all to blame, yes, she’s a complete fuck-up, but it was my mother who told me every single problem that arose (for herself, my sister and sister’s kids) which led to me having to fix or improve things. It was exhausting but I thought we were all equally there for each other.

It took 30 years for me to see I was being used. My sister continued on her destructive path and my mum rewarded her with leaving her, her house (saying she needs it because she gave up her ‘perfectly’ good council place) and me nothing.

This was the icing on the cake for me. An opportunity to say ‘no more’!

I no longer allow people to get me involved in family drama. I’ve learnt my lesson and I wouldn’t swap the peace and quiet I now have for all the money in the world.

Edited

Yes yes yes and yes. It sometimes means that I feel isolated and lonely but I never want to return to the weird dynamic which kept me permanently anxious and on edge. Expected to help support and fix and then have it relentlessly thrown in my face as interfering whilst simultaneously using me for various things including money and emotional labour . Too much

T1Dmama · 14/01/2026 09:09

@aerisgainsborough

Tell her she’s being immature and irresponsible dating strangers and meeting them in private places! Why the feck would anyone meet up with someone who speaks about choking them?! That’s insane!
I’d be suggesting she sees a counsellor and a doctor and maybe gets on her meds for her bipolar/receives counselling for her issues.
I think you need to tell your family, it’s ok to keep confidences but not when she’s acting so dangerously! Get you parents and sister to sit her down and tell her that you all love and care so so much about her, you tell her that her behaviour is affecting your mental health because you’re worried sick about her life choices! Tell her to go out with friends and discover herself and be single for a little while… join the gym, or Pilates or something and meet people a healthy way, … and to date only single people!…. Not people promising to leave their partners (we all know they rarely do!!).
meeting people on line isn’t safe and shagging around is just self destructive behaviour … and damn right dangerous!

Why they decided to lie to everyone & ‘pretend’ everything was ok is beyond me too really, in her shoes I’d have told everyone prior to Christmas and just spent the day with their own families!

I don’t agree with others that you need to back away…. christ she’s your sister and clearly needs support right now! Mumsnet seems to hate people helping each other and I don’t get that! I would however tell her that her behaviour is making you ill and tell her that while you’re happy to be her comfort & support, you will not support nor will you keep reckless / dangerous behaviour secret as you have moral responsibilities to tell your parents!…. I mean what happens if she does get murdered by this weirdo?!… and you knew she was going there and didn’t tell anyone?!?..in fact I’d be tempted to put in a police report about this guy… encase there’s women missing in his block of flats!!

T1Dmama · 14/01/2026 09:10

sorry it double posted for some strange reason

T1Dmama · 14/01/2026 09:27

I disagree and think the info was needed as is all relevant to why you’re so worried about sisB!
If you’d added info later you’d have been accused of drop feeding

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