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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:
NewName24 · 10/12/2024 16:55

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.

This, and as the first reply said, you went into this with your eyes wide open.

You knew it was a difficult way to live, but then decided to get pregnant and decided to move back in.

Allmychickenscometoroost · 10/12/2024 17:05

Even their mother made a hurtful remark implying my child could just as easily have been his brother’s.

This is the most disturbing thing I have come across. This entire family is utterly enmeshed and dysfunctional. But agree with posters that you have to take responsibility for being part of this odd set up.

OhHellolittleone · 10/12/2024 17:05

I thpught this would be similar to the situation I was in. My now husband had just bought a house with his brother when we met. I moved in after a while, but was v keen to move out! It took 3 years, I had to constantly remind him to seek legal advice etc, but eventually we bought a house together and got married/had a child. His brother is very involved, he comes round every weekend and I’m so grateful for
his help. I love that he experiences fatherhood, as much as he ever will, by having a close relationship with our children.

You need a come to Jesus conversation with your husband. Either you all move out, or you’ll move out alone.

Rowen32 · 10/12/2024 17:07

It sounds like they're both really benefitting from this arrangement OP, why would they change it?
You'll have to do something though or you'll never be free

Boomer55 · 10/12/2024 17:08

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, Eyes wide open. 🤷‍♀️

Rowen32 · 10/12/2024 17:08

Allmychickenscometoroost · 10/12/2024 17:05

Even their mother made a hurtful remark implying my child could just as easily have been his brother’s.

This is the most disturbing thing I have come across. This entire family is utterly enmeshed and dysfunctional. But agree with posters that you have to take responsibility for being part of this odd set up.

Did she just mean looks wise though I wonder?

DenimTraybake · 10/12/2024 17:16

Thank you for all the replies.

I totally understand people's opinions that I walked into this.

My partner had promised that his brother would separate from him and start to have his own life away from us eventually, as their paths changed, but maybe I was naive to believe this as it hasn’t happened. His brother just likes to hang out with us and be involved with what we are doing. We live together so it's hard to get space. I didn't mind the relationship they had at first because I am quite independent and like lots of time alone. I am an introvert and my partner is an extrovert so it was nice that he had his brother to go out with to all the social events I wasn’t interested in going to. But it’s different now that we have a child.
I never had much luck with relationships previously (single for 8 years), and once I found my partner it was great, I didn’t think I would get another chance at being with someone I loved who also wanted to be with me. When I first moved out it was back to the houseshare I was in, but the situation there had changed and it wasn’t a great environment. I was also about to be made redundant. I would have had to move back to the north to live with my family in an unhappy situation. My partner was the only one who was there for me and supported me, I was alone and I really really wanted to make it work, because I didn’t want to go back to my previous life, even if this one was perfect.

Some posters have said the BIL might also not be happy, I am not sure this is true. He loves his niece and I am certain if it was his choice we would all stay living together. He has dragged his feet (as well as my partner) with moving forward with the house move because they don't like change, and are both happy with the situation. I am the only one that isn't happy. I think he was unhappy when I initially moved in because he knew it would mean he’d have to share his brother with me. Honestly I do not understand their relationship, but I am told that no one but twins really get it.

Unfortunately, I can’t move out on my own. I live in London and work part-time, so I don’t have the finances to make that happen.

It’s been really interesting seeing everyone's responses.

OP posts:
CeciliaMars · 10/12/2024 17:19

Oh my gosh - you're with both of them! They are very weirdly co-dependent at this age. I am an identical twin, and find the fact that they have joint bank accounts and still get Christmas cards addressed to both of them VERY strange. Your DP needs to unmesh pretty quickly, else I'd be out of there.

DenimTraybake · 10/12/2024 17:20

@Terrribletwos I mentioned it because the poster implied that my bil might be secretly sleeping with me.

OP posts:
LilyJessie · 10/12/2024 17:23

I had to live with my partner and his brother for a while.
I moved in with them during COVID.
It was okay to start, but after a few months, I found it unbearable. His brother was way too involved in our life.
After some time, I made it clear with my partner I wasn't willing to live like that, but didn't issue ultimatums.
My partner recognised (after being a bit stroppy and saying I was being unfair to his brother), that it was uncomfortable for me. The brother moved out.

They're still very close, and his brother is welcome over and there is no animosity there. But after he moved my partner realised how much better our home life was.

Three most certainly, is a crowd.

If your partner is not willing to be with just you, and you're not willing to live with his brother, then you know what you have to do. You'll have to move out.

TeenLifeMum · 10/12/2024 17:27

I’m unclear what you’d like him to do. Unless you live in a mansion, he’s going to be around, using the kitchen, living room in his own house. Do you want him to hide in his bedroom?

HollyKnight · 10/12/2024 18:16

It just sounds like you wanted a baby regardless of what it would mean for that baby. You're not the first woman - and won't be the last - to put her urge for a child first. The result of that now means either you will be unhappy, or everyone else will be when you force a change in living arrangements. Either way, the kids end up suffering when their parents aren't happy.

Hayley1256 · 10/12/2024 18:30

This sounds like a frustrating situation. I would try taking you BILs input about how to raise his Niece with a pinch of salt. The bond he will have with his Niece will be amazing as she gets older and its always handy to a have a babysitter

Tink3rbell30 · 10/12/2024 18:52

This won't change. Why would you get pregnant twice?!

SoNiceToComeHomeTo · 10/12/2024 18:53

Probably not a good idea to live with identical twins, is the moral of this story. Identical twins can feel almost like the same person and BIL probably does think of himself as a third parent with equal rights. You need to find a way of living separately from him. If your DH is against this or makes excuses, you have a real problem.

gannett · 10/12/2024 21:48

Honestly, given the circumstances I think this is one of the more positive outcomes there could have been. It would have been far more likely for your partner's twin to resent being saddled with an extra girlfriend he hadn't planned to live with, who kept moving in and out, and then on top of that a baby and now another pregnancy. It would have been more likely that he would have either forced you to move out of his house, or just made your life unpleasant while you were in it. Instead he seems to actually enjoy the arrangement, even to the extent of having an active and loving uncle relationship with your child. (I can see why the "second dad" comment rubbed you the wrong way but essentially that's what it is - he's an uncle who loves his niece.)

I don't think it would help to start throwing around therapy jargon like "enmeshment" or calling them weird. Twins being closer than most siblings isn't unusual.

What's unusual is the living arrangement where you're trying to raise your daughter as a lodger in their house, and that's leading to the tensions. I understand moving out is a medium-term solution by necessity but it's the only one. I also think once you move out and don't have your BIL always around and able to involve himself, you'll appreciate the positive bond he's built up with your daughter.

gannett · 10/12/2024 21:49

Really, given that your BIL envisaged his house as a bachelor pad to share with his brother, the fact that he's embraced his role as live-in uncle is probably something you should be thankful for. It could have gone very differently!

Bex5490 · 10/12/2024 22:14

DenimTraybake · 10/12/2024 17:16

Thank you for all the replies.

I totally understand people's opinions that I walked into this.

My partner had promised that his brother would separate from him and start to have his own life away from us eventually, as their paths changed, but maybe I was naive to believe this as it hasn’t happened. His brother just likes to hang out with us and be involved with what we are doing. We live together so it's hard to get space. I didn't mind the relationship they had at first because I am quite independent and like lots of time alone. I am an introvert and my partner is an extrovert so it was nice that he had his brother to go out with to all the social events I wasn’t interested in going to. But it’s different now that we have a child.
I never had much luck with relationships previously (single for 8 years), and once I found my partner it was great, I didn’t think I would get another chance at being with someone I loved who also wanted to be with me. When I first moved out it was back to the houseshare I was in, but the situation there had changed and it wasn’t a great environment. I was also about to be made redundant. I would have had to move back to the north to live with my family in an unhappy situation. My partner was the only one who was there for me and supported me, I was alone and I really really wanted to make it work, because I didn’t want to go back to my previous life, even if this one was perfect.

Some posters have said the BIL might also not be happy, I am not sure this is true. He loves his niece and I am certain if it was his choice we would all stay living together. He has dragged his feet (as well as my partner) with moving forward with the house move because they don't like change, and are both happy with the situation. I am the only one that isn't happy. I think he was unhappy when I initially moved in because he knew it would mean he’d have to share his brother with me. Honestly I do not understand their relationship, but I am told that no one but twins really get it.

Unfortunately, I can’t move out on my own. I live in London and work part-time, so I don’t have the finances to make that happen.

It’s been really interesting seeing everyone's responses.

I completely understand this. It’s easy for people to say ‘you chose this situation’ or ‘you knew what you were getting into’ but it’s not easy for everyone to find happiness and you fell in love.

Of course you wanted to try and make it work with someone who loves you and other than having a weird brother is good to you.

People love to talk as though only perfection will do. You’ve got a good man, beautiful children and a well-meaning but slightly irritating BIL. Could be a lot worse. 🤷🏽‍♀️

For those saying why get pregnant, OP has brought kids into the world who are surrounded by love which is more than many do.

I would keep pushing the move for sure. And can you try to establish some boundaries until then? Maybe have set ‘family time’ for you, DP and the kids?

crouchendtigerr · 10/12/2024 22:25

During my first marriage, we had a child at the wrong time and were completely broke, so moved in with his mother and two sisters, they were fabulous, like Aunts that were de facto mothers.
Lots of people would love to have someone in their children's lives who loved their children so much.

Just try to see the advantages. It's wonderful for your children

Codlingmoths · 10/12/2024 22:36

Could you move out if your dp was paying child support? As moving would be a deal breaker. I’d say by September next year we are not living here. I see my options as moving out and separating and claiming child support and benefits so I can afford rent, moving out and going back to my parents and separating of course, or moving out with you. I’d prefer the third, but it will be one of those.

the joint bank account would be a deal breaker too, as would cards and things addressed just to dh and his brother. Tell your dh if he wants you in his life he needs to make sure his family behave like it, if they continue to leave you and baby out you will quite obviously just not bother with a relationship with them, it would be bullying in the workplace to regularly leave someone out and it is the same in a family.

Sjh15 · 15/12/2024 07:46

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.

Rubbish! My DP is a twin he’s nothing like this! They are just like normal brothers! This isn’t normal especially the joint bank account

MrsCarson · 15/12/2024 08:44

He's future faking and telling you anything you want to hear, just so he can carry on as it is. It won't changed he's weirdly dependant on having his brother so close.
You're on your own and need to decide if this is how you want to live for the rest of your life.

Ireallywantadoughnut36 · 16/12/2024 14:13

I'm kind of with everyone else here - yes it is weird and annoying and frustrating and it's totally reasonable to want a relationship with just your partner BUT this was always how it was. You should've made it a condition of getting back together that he'd move out from his twin and become his own entity.

I don't think the brother is out of line saying he's experiencing parenting because he basically is, he lives with his niece and your partner uses him to help out with his parenting, you didn't create this situation but he's not just a normal uncle.
If I were you I'd draw some boundaries- they don't need a joint account to split bills and mortgage, so that should stop and you should have one if you wish. Set a date to sell/move, ensure he knows the steps required for this and make sure he gets the ball rolling. Insist on some time to be yourselves somewhere without his brother (day trips, family holidays), you need to re draw the lines of what is/isn't your/his nuclear family. If he doesn't want to, you need to put a deadline on it and be brave and go. Ultimately, at the moment, it sounds like his brother and his family are his "home" and you're his girlfriend and mother of his kids, so see if he will re draw those lines and if not, you know where you stand.

I'd ignore the little comments, they're not important, they're annoying you because the situation is telling you that your partner isn't doing what he should and what you want. Don't lash out at his brother or parents because this isn't their doing, it's yours and your partners for creating this odd living scenario and then your partners fault for not dealing with it.

BruFord · 16/12/2024 14:26

How do the finances work if he has a joint account with his brother? Do they pay the mortgage and all the household bills together and you're essentially a guest in their house? You describe him as your partner so I'm assuming that you're not married.

You're not in a good position, OP, they could ask you to leave any time. You definitely need to work towards getting a place with your DP and ensuring that you're on the deeds or tenancy.

DenimTraybake · 19/12/2024 22:46

I pay into their joint account, which they set-up before I moved in. It's used to pay the bills and mortgage.

OP posts: