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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

AIBU to feel drained by my sister-in-law constantly making things about her?

34 replies

Idealist3 · 04/04/2026 22:26

Hi Everyone
This is something I have been thinking about for a while now. I’d really appreciate some outside perspective on this, as I’m starting to feel quite drained and unsure if I’m overthinking things.
I have a long-term friend who is now also my sister-in-law (she ended up marrying my brother). We weren’t especially close in school, but lived together when we were younger and stayed in touch over the years.

Looking back, I feel there has always been a bit of a competitive dynamic. For example, when we were younger and going out, I often had the sense that if I got attention from men, she would imply (subtly) that I was “lucky” and that they were really more interested in her. At the time I brushed this off.

When I got engaged and was getting married, she had just come back from travelling and her behaviour felt a bit off. On my hen and wedding, she was making comments like I’d been very drunk when I met my husband, and generally joining in with my sisters in a way that felt a bit undermining. The night of my wedding, she got together with my brother, which I didn’t think much of at the time, but the following day the focus shifted onto them. A few months later she even joked that they had “stolen my thunder,” which really stuck with me.

Over the years since, I feel there’s been a repeated pattern where if I share something about my life, she brings it back to herself. For example, if I mention my kids, she redirects to hers. When my father passed away and we were holding the wake at home, she told me (but no one else) about a health issue her own mother was having, and I ended up comforting her instead of the other way around.

More recently, I shared in a WhatsApp group that I’m applying for my boss’s job (a CEO role), which is a big deal for me and something I’m nervous about. Her response was to mention her own work situation and how many people she manages, before wishing me luck. When I said I was nervous, she again redirected to her own worries about her children. I came away from the exchange feeling deflated rather than supported.
There are other small examples over the years, but it’s the overall pattern that’s getting to me. I often feel like interactions with her are draining, and I don’t feel particularly supported or celebrated.

Because she’s my sister-in-law, it’s not a straightforward friendship I can step back from completely. But I do find myself wondering if, had she not married into the family, we might have drifted apart naturally.

I suppose my question is: am I overthinking this, or is it reasonable to feel this way and to start putting some distance in place (e.g. sharing less, lowering expectations, etc.) rather than confronting it directly?
Thanks for reading if you got this far.

OP posts:
backagainohdear · 06/04/2026 08:44

I would make a separate chat just for your sisters, and exclude her as much as possible. Don’t tell her anything private and when you do meet make sure your brother is there. Distance yourself as much as possible, she’s not your friend she’s one of those competitive idiots and needs to dealt with in that manner.

southcoastsammy · 06/04/2026 08:50

backagainohdear · 06/04/2026 08:44

I would make a separate chat just for your sisters, and exclude her as much as possible. Don’t tell her anything private and when you do meet make sure your brother is there. Distance yourself as much as possible, she’s not your friend she’s one of those competitive idiots and needs to dealt with in that manner.

This. Have a grp with just your sisters - she’s not your sister. Shes massively insecure and wi not change. All you can do is reframe how you react to her.
I did this with my SIL and it helped massively.

Catcatcatcatcat · 06/04/2026 09:01

Put her on an information diet and see her as little as possible.

southcoastsammy · 06/04/2026 09:37

You’re completely entitled to have a separate chat grp with your sisters. Then use that for most info. I have one with just me and Dsibs, and one that includes parents too. The in-laws family chat grp I am on but rarely use as it’s dominated by DSIL. DP also has one for just that side of the fam with me not on it.
Sometimes people just want to chat with their own side of the family for personal AND practical reasons ie chatting about what to get someone for a birthday or similar.

Ahwelltoobad · 06/04/2026 09:47

Agree with previous posters, but must add: yay for applying for that CEO role! 💪💪💪

SuperSange · 06/04/2026 10:01

Stop telling her stuff. She can’t comment on what she doesn’t know about. Have you heard of grey rock? I’d be doing a bit of that. Nice, but superficial.

Greymatterwriter · 06/04/2026 10:07

Where I have encountered this behaviour before not necessarily directed at me but there were two triggers for the behaviour, unhappiness in themself and insecurity. The behaviour itself is draining for sure but you can stop giving it any headspace. Don’t continue to view her as a friend, she does not behave as a friend so change her mental category for you and then tell her only stuff that you would tell people who were not friends. You are still kind, pleasant and polite to people who are not friends but you don’t view them as part of your life.

Idealist3 · 06/04/2026 13:54

Catcatcatcatcat · 06/04/2026 09:01

Put her on an information diet and see her as little as possible.

I love this! And a lovely way of putting it catcat! Life is far too short to be dealing with it. I read
somewhere about the concept of an “emotional hijacker”. I always try and be diplomatic and supportive of her but it’s sorely missing in the other direction. I’m sure am not perfect but I definitely try and be more aware. Thank for this!

OP posts:
AllGoodNamesRGone · 06/04/2026 19:35

This sums her up:

'Narcissistic personality disorder is a mental health condition in which people have an unreasonably high sense of their own importance. They need and seek too much attention and want people to admire them.'

I have a MIL and SIL like this. Cut them out of your life and have as little contact as possible. You will feel so much better.

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