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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Overly involved brother-in-law

82 replies

DenimTraybake · 10/12/2024 14:17

I currently live with my partner and his twin brother. My partner and I met a year before they bought a house together. We got serious quickly and wanted to settle down, but he was already in the process of buying a house with his brother—a plan they had been working on for years, saving for a deposit, going to viewings, and making offers. When their offer was accepted, I realized I wasn’t entirely comfortable with the situation. At 33, I wanted children soon and a home of our own.

I expressed my concerns, but my partner explained that he had promised to help his brother buy a house and couldn’t break that promise. He said it was only for three years; after that, they would sell, and we’d get a place together. A few months later, COVID hit, and I moved in so we could be together during restrictions. At first, it was tense—I felt like an outsider, his brother resented my presence, and their family and friends seemed to downplay our relationship. It was all about “the twins,” and I was on the sidelines.

After a few difficult months, I moved out, and my partner and I nearly broke up. But life outside the relationship was lonely, and my partner worked hard to win me back. His effort made me realize how much he loved and cared for me, which deepened my love for him. We reconciled, and my relationship with his brother improved. A year later, I became pregnant.

However, things became strained again after our baby was born. His brother became overly involved, giving unsolicited advice, acting like an expert, and making comments about being a “second dad.” Even their mother made a hurtful remark implying my child could just as easily have been his brother’s. His brother would talk about my DD to others as if she were his, saying he could “experience fatherhood” through her. This upset me—I chose my partner to have a baby with, not his brother.

I wanted to move out but found it overwhelming with a newborn. Over time, things improved slightly as my DD grew older. His brother plays with her a lot, which I appreciate, but he often oversteps, trying to parent her in my presence—worrying about her meals or hydration when that’s our responsibility. Sometimes I address it, but other times I’m too tired, which likely sends mixed signals. Constantly reminding him is exhausting.

Now, I’m pregnant with our second child, and my desire to move has intensified. The dynamic between the twins is difficult to navigate—they work together, have always lived together, share friends, and even have a joint bank account (while my partner and I don’t). Small things add up, like Christmas cards addressed only to them or joint presents for their family, which leaves me feeling excluded.
While his brother helps with our DD and my partner relies on him for support, it frustrates me that my partner hasn’t fully experienced solo parenting. This lack of experience made him less empathetic when I struggled early on. Recently, his brother sent me an article about foods to avoid for children, something I doubt he’d send to other parents. I can’t tell if I’m being overly sensitive due to pregnancy or if my feelings are valid.

I don’t feel like we’ve had time to bond as a family of three—it often feels like it’s either me and my DD, or me alone while my partner and his brother bond with her. My partner understands how I feel and has agreed that we’ll move out this year. Still, I can’t help but wonder: am I being too harsh, or are my feelings reasonable?

OP posts:
Hoppinggreen · 10/12/2024 15:47

Ok, I will make this as simple as possible for you.
OP's partners twin brother did NOT ask for his brothers girlfriend to move in with them and get pregnant twice. He may not have been happy about that
Is that clear enough now?

ATastingMenuButItsAllCrisps · 10/12/2024 15:49

@SalsaLights OP is legally single, choosing to live in a property owned by these two blokes, zero legal protection.

Minerbirdy · 10/12/2024 15:49

You experienced this first hand and still went ahead with it, and you’ve it’s happening again…..?

JFDIYOLO · 10/12/2024 15:49

This is ... weird.

Yes, you did walk into every aspect of it with your eyes wide open so it's not like you were deceived.

The kids will soon be noticing - or their friends will soon be telling them - how incredibly weird it all is.

I don't quite know how to ask this, but ...

OP, are they identical?

Is there the remotest possibility that they might be ... sharing you? And you haven't noticed? Especially with their mother's equally weird comment.

Just read a book called Touch Not the Cat where this happens, so it's probably high in my mind.

Personally I'd be going all out to get the break made and start your independent life with your partner and children. This must all surely be getting in the way of his brother finding a relationship of his own?

Gazelda · 10/12/2024 15:51

BIL bought a house with his twin, as had always been planned.

A girlfriend moved in very quickly , moved out and back in again. A baby arrived. another is on the way.

I don't think he's been treated very well, not his home and life plans respected.

Your DP has been unfair to both of you.

They sound a little too involved. And I'm not surprised you resent his input into your parenting. But your DP has caused all of this. BIL has simply gone along with his twin's choices.

I'd move out if I were you. Get your own place with the children. It's then up to your DP to decide who he lives with.

Terrribletwos · 10/12/2024 15:51

Hoppinggreen · 10/12/2024 15:47

Ok, I will make this as simple as possible for you.
OP's partners twin brother did NOT ask for his brothers girlfriend to move in with them and get pregnant twice. He may not have been happy about that
Is that clear enough now?

No, that's really harsh. Maybe op was absolutely in love with this guy and enmeshed and didn't expect it would go this way?

NiftyKoala · 10/12/2024 15:51

ManhattanPopcorn · 10/12/2024 14:35

You knew exactly what you were getting into here. You chose to move back in. You chose to get pregnant a second time.

It brings to mind that quote that the definition of insanity is doing the same thing over and over again and expecting different results.

YABU for expecting different results.

This. As you have found out you cannot live this way. And why should you? Either you dh and dc move. Or be miserable until you end up divorced.

Hoppinggreen · 10/12/2024 15:54

Terrribletwos · 10/12/2024 15:51

No, that's really harsh. Maybe op was absolutely in love with this guy and enmeshed and didn't expect it would go this way?

Not harsh, statement of fact.
I have sympathy for OP as well but I am looking at it from the BIL's perspective

AcrossthePond55 · 10/12/2024 15:56

@DenimTraybake

Your DP obviously feels that his/his twin's/the family's behaviour is 'normal' and he's happy with the dynamics 'as is'. So unless your DP gets counseling with a true desire to become 'unmeshed' with his twin and his family, you will always be the third wheel. There is nothing you can say or do personally to accomplish it. He has a whole lifetime of this behaviour to unravel. And frankly I don't know if it's completely possible with twins. They say that bond is very strong, much stronger than between 'just siblings'.

I think it's going to come down to stay and put up with it or leave a get your own place. You can decide then if you want to be 'together yet living apart' from your DP or if you want to simply co-parent as 'former partners'.

snotathing · 10/12/2024 15:57

So it's been over 4 years and your boyfriend said he'd sell in 3. Have you raised this with him?

myconfessionname · 10/12/2024 16:04

GabriellaMontez · 10/12/2024 15:23

Twin relationships can be very complex. Especially male twins.

That's not going to change.

I don't know how you tolerate it. It would drive me insane.

Yanbu to leave. Or continue a relationship living separately if you want.

You were crazy to go back there.

yes, this
I dated a (female) twin for a few years.
It took a lot of time for me to realise that she was so deeply enmeshed with her Sister that she would always, always come first and I was never going to mean much. She was deeply afraid of not jumping when twin said how high.

I got out, after realisng the whole dynamic was not for me and had already caused me some psychological damage.

OnlySlightly · 10/12/2024 16:09

I think male twins’ relationship can run very deep. A good friend of mine is an identical twin, he and his twin brother felt too enmeshed in their schooldays, decided to try to split up, but both wanted to go to the same university, had a catastrophic falling out in first year (you can imagine — two very high-achieving identical boys doing the same subject), his twin transferred to a university in another country, and they didn’t speak for nearly ten years.

Bex5490 · 10/12/2024 16:17

I feel sorry for your DP’s twin.

When he decided to buy a house with his brother, he didn’t know that would include a woman and then two children.

I feel sorry for you too @DenimTraybake because I couldn’t live like that.

Right now, your DP is in his ideal situation. He wants to be with both of you so why would he change this when he thinks you’re willing to go along with it?

He needs to choose which one of you he wants as his life partner…he can’t have both unless you let him 🤷🏽‍♀️

DenimTraybake · 10/12/2024 16:26

@JFDIYOLO

Haha.

They are identical, but there are enough facial differences that I can tell them apart. The brother is also gay.

OP posts:
unclebuck · 10/12/2024 16:28

His twin is his life partner and you are the mother of 'their child' - I'd make a sharp exit and not visit!

Startinganew32 · 10/12/2024 16:30

Yeah you chose this OP. The relationship between you and your DP seems a bit doomed whereas he will have his bond with his twin for life. It was naive of you to think he would choose you.

Startinganew32 · 10/12/2024 16:31

Also I bet he’s saying the experiencing fatherhood stuff to try to piss you off

DenimTraybake · 10/12/2024 16:34

@snotathing Yes, I have spoken to him a few times, but financial reasons have always come up for not being able to move. However, he has accepted that it need to happen in the next year, but it is unlikely to be quick because we live in London.

OP posts:
Rocksaltrita · 10/12/2024 16:35

Buy his twin out of the house? Their relationship is not normal at all!

MounjaroUser · 10/12/2024 16:37

Why do they have a shared bank account? Is that just for bills or does everything go into that? I've never heard of siblings having a joint account.

Terrribletwos · 10/12/2024 16:40

Not sure why you mentioned he's gay thats of no relevance!
Your husband, however, is taking the piss

ATastingMenuButItsAllCrisps · 10/12/2024 16:43

@Terrribletwos OP was replying to a post that asked if these men were sharing her. There is no husband, seems OP is the third wheel to these men.

WhichEllie · 10/12/2024 16:47

DenimTraybake · 10/12/2024 16:26

@JFDIYOLO

Haha.

They are identical, but there are enough facial differences that I can tell them apart. The brother is also gay.

Edited

I had a feeling this would be the case. There are studies on identical male twins and gayness/homosexuality that you may want to look at.

Move out and prepare to coparent. Better to rip the plaster off now then to find out he’s cheating on you with men seven years
from now. While it’s not 100% that he is also gay, it’s something like 68% statistically speaking (at least in the last study I saw looking at it). Combine those chances with the weird, almost romantic relationship that he has with his gay twin and you’d have to be utterly mad to stay.

cheddercherry · 10/12/2024 16:51

This is a really extreme behaviour even for siblings but tbh you knew about it, left and for some reason I can’t fathom went back in to the situation! So no I don’t think you’re at all unreasonable for wanting out but I think you’re unreasonable to have expected second time round to be any less weird/ overbearing/ problematic.

trivialMorning · 10/12/2024 16:55

You probably need that dreaded word - boundaries - and consistent ones and your DP on side. Moving out would be a massive help with that as would leaving the weirdness.

This is not normal - and I think the wider family are a huge problem here as well as BIL and your DP.

When I grew up there was this awful tendency to label me and much younger sibling - as the girls - the girls like this or thought that - it was horrible for us but your DP and his brother seem to have embraced it.

I think constant push backs with BIL overstepping is only way but that's hard work - did it with IL and they weren't in same house always there like your BIL.

Try setting dates with DP - as I think he's happy and he'll let the situation go on and go even if you get very unhappy.