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Relationships

Mumsnet has not checked the qualifications of anyone posting here. If you need help urgently or expert advice, please see our domestic violence webguide and/or relationships webguide. Many Mumsnetters experiencing domestic abuse have found this thread helpful: Listen up, everybody

My sister is having an affair, im the only one who knows

28 replies

Crimble123 · 15/11/2025 11:33

She's put me in an awful position and im so angry at her.
She has 2 small children and a long term boyfriend. Given the boyfriend is not perfect and he hasn't always been there for her but he is a good dad and works hard. He gives her all the money she could want and she doesnt work.
She herself doesnt treat her boyfriend well either.
This new guy she met off the Internet is way older than us. She hasn't known him long and already there is drama better them both apparently. She told me last week he blocked her because she started on them. She's making excuses all the time to not be at home and meeting this guy. Her boyfriend is with the children and taking them out alone. I feel so sorry for them but I cant say anything.
Ive text her and told her to sort it out. Either leave boyfriend or cut it off witg the other guy. She wont though because she gets all the money she wants, if she left she would have nothing.
Its becoming more obvious as shes acting so suspicious. Our mum is suspicious. Last week me and her were out and she wanted to leave early she said because she weren't feeling great but I think it was so she could see this other man.

What do I do? Im feeling more and more angry at her. I just feel shes going to ruin christmas some how because thats the type of person she is. I don't know what to do

OP posts:
TamarindCottage · 15/11/2025 17:45

Notyours1 · 15/11/2025 13:51

Say nothing and don't get involved. Do not have a paper trail with your sister regarding this. When it comes out ( which it will) she will look for somebody to blame or to be an accomplice and it will be you.

Distance yourself and don't engage with her at all regarding the affair.

I agree with this. When the shit hits the fan, which it will, staying out of it will mean none of her shit falls on you. Any time she brings it up, change the subject or be otherwise busy

ChessorBuckaroo · 15/11/2025 17:47

Beenwhereyouareagain · 15/11/2025 17:13

😱😱

Did laugh at that. I'm guessing she is an OW herself (or has been).

Waiting for the follow up: "her partner is probably a terrible shag, let her enjoy her fun with new guy".

Beenwhereyouareagain · 15/11/2025 18:48

ChessorBuckaroo · 15/11/2025 17:47

Did laugh at that. I'm guessing she is an OW herself (or has been).

Waiting for the follow up: "her partner is probably a terrible shag, let her enjoy her fun with new guy".

😘

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