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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:
Cantheowneroftheredcorsapleasemovetheircar · 09/01/2026 13:37

To answer the question - yes, you're being unreasonable to be stressed.

This is their drama. Why is it bothering you so much??

People love all sorts of lives.

As for not being the person you thought she was - you knew she was a cheater? She did it 10 years ago?

All of it, including your emotional investment in your sister's marriage, is a bit weird.

Redrosesposies · 09/01/2026 13:39

No you are not being unreasonable to be stressed about all this drama, but you are being unreasonable to be so involved with it all.
Take a step back, right back. Tell your sister that you don't want to know what's going on in her life right now, she is an adult who can deal with her own affairs and you tell your parents and the rest of the family to speak directly to her if they want to know what's going on and stop involving you.
Just prioritise yourself and your own immediate family for a few weeks and let everyone else crack on.

Raisinsaretheonlyfruit · 09/01/2026 13:40

If I were you or more importantly your husband I'd move way more than 5 miles away and develop a network away from your family. Its really not your issue and you literally need distance

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.

CarlaLemarchant · 09/01/2026 13:42

Well that took a weird turn at the end.

Re her marriage. Stay out of it, not your problem. Dont let them all burden you, stop being the sounding board.

Re the strangers she’s meeting. All you can do if advise her to make good choices and share her location with someone when she’s out.

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.

Netcurtainnelly · 09/01/2026 13:47

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.

Good god. Please distance yourself from your sister and enjoy life.

Its got nothing to do with you anyway.

mumofoneAloneandwell · 09/01/2026 13:48

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.

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 😬

Evaka · 09/01/2026 13:48

Cantheowneroftheredcorsapleasemovetheircar · 09/01/2026 13:37

To answer the question - yes, you're being unreasonable to be stressed.

This is their drama. Why is it bothering you so much??

People love all sorts of lives.

As for not being the person you thought she was - you knew she was a cheater? She did it 10 years ago?

All of it, including your emotional investment in your sister's marriage, is a bit weird.

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.

Evaka · 09/01/2026 13:49

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.

Agree :). Very good advice.

Tresd · 09/01/2026 13:50

B sounds like exceptionally hard work.

You should directly say to her that this man with massive hands could kill her and that the risk she is taking is extremely reckless. Since your parents want info, tell them as well.

Then take a step back and try to not be so involved in her nonsense.

StoppingByWoodsOnAColdEvening · 09/01/2026 13:52

Agree with @Cantheowneroftheredcorsapleasemovetheircar and @Frenchfemme -- just let your sister live her life, while telling her to obey basic safety rules when dating, only meet Kink Guy in public and to share her location with others.

I'm also an eldest child. You can't change other people's behaviour. You can change how you respond to it, and limit your emotional investment in it.

JLou08 · 09/01/2026 13:54

"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 "

You've said it yourself. You're all way to enmeshed. Just focus on your own life, you shouldn't be getting stressed with your sisters relationship issues. She's an adult who can take care of herself.

I know you said your autistic so you may not have realised this. The big hands and choking comment is much more likely to be a sexual reference. Some people are turned on by things like this and I'm guessing your sister is one of them, otherwise she would be cutting contact with him, not going to his flat. Unless your sister is very naive and vulnerable, I don't think you need to be worrying about her safety, she may have initiated the talk around choking.

aerisgainsborough · 09/01/2026 13:56

Cantheowneroftheredcorsapleasemovetheircar · 09/01/2026 13:37

To answer the question - yes, you're being unreasonable to be stressed.

This is their drama. Why is it bothering you so much??

People love all sorts of lives.

As for not being the person you thought she was - you knew she was a cheater? She did it 10 years ago?

All of it, including your emotional investment in your sister's marriage, is a bit weird.

She tries to make it my problem when she’s telling me the whole sordid story, crying because she’s left her husband for a much younger lad. Then asking for advice on how to ensnare him and should she send an anonymous message to the lad’s partner exposing their affair. Then she’s swearing me to secrecy and then fucks off down the other end of the country to play happy families with her in-laws. I can’t cope with things like this, my brain short-circuits. Maybe because I’m autistic, I don’t know. I’m normally resilient but this was too much. I feel how I feel.

OP posts:
Jamaicaningmecrazy · 09/01/2026 13:56

You’re too involved

outerspacepotato · 09/01/2026 13:58

Stop your sister confiding in you. You don't want to hear about her marriage or sex life.

Read up on enmeshment. Learn to say no. See them less and develop your own life more.

5128gap · 09/01/2026 13:58

I'm not surprised sister B had low self esteem with you and sister C constantly overlooking and judging her for every aspect of her life.
You can't on one hand complain that her 'drama' causes you intolerable stress while continuing to be invested in and have an opinion on every detail of her life, even to the fact she isn't 'busy' enough at the weekend; and consider yourself 'betrayed' because you weren't updated as to the exact state of her marriage.
If her life is stressing you, then you need to take that as a sign of your own over investment and back off a little. Find another subject to bond with your other sister over and give the family scapegoat a rest.

aerisgainsborough · 09/01/2026 13:59

JLou08 · 09/01/2026 13:54

"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 "

You've said it yourself. You're all way to enmeshed. Just focus on your own life, you shouldn't be getting stressed with your sisters relationship issues. She's an adult who can take care of herself.

I know you said your autistic so you may not have realised this. The big hands and choking comment is much more likely to be a sexual reference. Some people are turned on by things like this and I'm guessing your sister is one of them, otherwise she would be cutting contact with him, not going to his flat. Unless your sister is very naive and vulnerable, I don't think you need to be worrying about her safety, she may have initiated the talk around choking.

Oh right ok, I’ve taken it too literally then. It sounded very red-flaggy but also quite an over share if this is what she’s into :( either way not feeling great tbh. She is quite naive and used to walk home on her own and just go and stay over at lad’s houses when they hooked up.

OP posts:
SandrenaIsMyBloodType · 09/01/2026 13:59

People who don’t understand autism often suppose that it makes you unemotional. The opposite can often be true, especially for women. Kindly, your neurodivergence means that you are particularly ill-equipped to deal with this. You probably have an over-developed sense of what is right and wrong and it is unfair of any member of your family to try to draw you into drama and secrets. It is bound to make you feel constantly anxious.

You can’t control your sister’s behaviour anymore than you can control your emotional responses to it. You can, however, protect yourself by being clear about your boundaries. Experiment to find a phrase that feels authentic to you and shut down conversations that make you anxious and are essentially about things that are nothing to do with you; something like “I just cannot talk about this any more. It really upsets me and I need you to leave me out of it”. If they don’t yet understand how your autism is linked to your anxiety then it’s about time they learned. (Eldest daughter and mum to 2 DDs with AuDHD and an autistic DH).

WallaceinAnderland · 09/01/2026 14:00

There's way too much information in that post, most of which is completely irrelevant to what you're asking.

As pp said, it's their life, let them get on with it.

Say you're not interested in hearing about it and don't agree to secrecy.

aerisgainsborough · 09/01/2026 14:03

5128gap · 09/01/2026 13:58

I'm not surprised sister B had low self esteem with you and sister C constantly overlooking and judging her for every aspect of her life.
You can't on one hand complain that her 'drama' causes you intolerable stress while continuing to be invested in and have an opinion on every detail of her life, even to the fact she isn't 'busy' enough at the weekend; and consider yourself 'betrayed' because you weren't updated as to the exact state of her marriage.
If her life is stressing you, then you need to take that as a sign of your own over investment and back off a little. Find another subject to bond with your other sister over and give the family scapegoat a rest.

Everything I have learned about my sister’s marriage this past few weeks has been against my will. She told me all of this and even when I told her it made me uncomfortable, she insisted on “getting it off her chest” because “it was killing her”. I work in mental health and it means I get taken advantage of sometimes because I’m kind and want to help.

I’m not really keen on her lifestyle because they’ve never grown up past about 20 and I don’t want to hear about her being tired from staying up gaming online when I spent half the night on the floor next to my disabled son’s bed because his melatonin hasn’t kicked in.

OP posts:
surreygirly · 09/01/2026 14:04

Mind your own business

aerisgainsborough · 09/01/2026 14:04

WallaceinAnderland · 09/01/2026 14:00

There's way too much information in that post, most of which is completely irrelevant to what you're asking.

As pp said, it's their life, let them get on with it.

Say you're not interested in hearing about it and don't agree to secrecy.

It felt pertinent to the situation at the time of writing. Just a bit of context that probably wasn’t needed, true.

OP posts:
aerisgainsborough · 09/01/2026 14:05

surreygirly · 09/01/2026 14:04

Mind your own business

I wish she’d let me, believe me. Got enough shit of my own.

OP posts:
StoppingByWoodsOnAColdEvening · 09/01/2026 14:07

aerisgainsborough · 09/01/2026 14:03

Everything I have learned about my sister’s marriage this past few weeks has been against my will. She told me all of this and even when I told her it made me uncomfortable, she insisted on “getting it off her chest” because “it was killing her”. I work in mental health and it means I get taken advantage of sometimes because I’m kind and want to help.

I’m not really keen on her lifestyle because they’ve never grown up past about 20 and I don’t want to hear about her being tired from staying up gaming online when I spent half the night on the floor next to my disabled son’s bed because his melatonin hasn’t kicked in.

So you hold up your hand and say 'I'm going to stop you there, Angela. I don't want to hear about this.' No one has you at gunpoint forcing you to listen.