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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

How to deal with this situation? BIL & his kids as a result of an affair?

299 replies

jojobooh · 20/11/2025 14:41

Basically my BIL had an affair behind his long term partners back (has a son (10) & a daughter (14) with her) which resulted in twins being born who are now 5.

The kids have never met and are not aware of the existence of each other because of several reasons.

We have DC who are closer in age with the twins and have play dates often.
Our oldest DC talks and understands and is very cleaver.

DC see both lots of cousins, obviously separately and are aware that they are cousins and family etc.

Were having a Christmas party for all the kids in the family next month in our home, just abit of festive fun for the kids.

Now as the kids are not allowed to meet each other BIL wants us to host the party twice to neither of the kids miss out.
I think this is absurd.

Whilst we want all the kids to be treated fairly and equally I find this request unfair and OH is supporting BIL.

Why should we have two parties?

Moving forward I think this will be a similar trend when DC have birthday parties etc or other future family events we host.

And when DC are older they will be forced to keep this secret which I don't think is fair or right at all to swear young kids to secrecy.

I just wanted to see if I was BU about refusing to host this second party and if anyone else has been in a similar situation.

OP posts:
Zempy · 20/11/2025 17:54

I don’t understand. Why aren’t the half siblings allowed to meet?

Everydayimhuffling · 20/11/2025 17:54

Christ, OP, that attitude really speaks volumes about your DH. I wouldn't trust him at all after that defence of his brother.

There's no way this is going to remain secret. How on earth does he expect your DC to not accidentally tell them? A PP is right that this is unlikely to last past the second party, so I would point that out to BIL (perhaps with a few other home truths). Them finding out from other people is certainly not going to make them hate him less!

WearyAuldWumman · 20/11/2025 17:56

Thanks @Arlanymor . You're right about ripples.

For various reasons, finding out later in life - when they were adults approaching middle age - made my family member's children feel very insecure. If only they had known sooner, it would have been easier. (My family member hadn't hidden anything from them - but they had never expected him to find his siblings, it seems.)

thepariscrimefiles · 20/11/2025 17:56

jojobooh · 20/11/2025 16:35

Apparently the partner he cheated on dosent want her kids to meet the twins either, I'm not really sure of the reasons.

She is understandably very angry and bitter about the whole situation and how she found out (the woman called her up out of the blue to ask when the kids were meeting).

It is very messy and BIL does need to put things right and be honest.
OH defends him to the core so it's hard to enforce/ say anything in relation to this.

OH's reasoning is "because the ex is an alcoholic my brother had the right to do what he wanted and it's her fault for making him so unhappy".

When I reason that most normal men would leave the relationship and have the courtesy and respect to tell the woman how he felt/end the relationship before getting someone else pregnant, he starts getting nasty and blaming the ex.

Your BIL is an utter disgrace but your not so 'D'H isn't much better. His brother has children by three different women who all soundreally damaged in different ways.

Your response to the suggestion (or really the demand) that you host two separate parties for all the family children to pander to your BIL and his ridiculous family situation should be an absolutely emphatic 'NO' and if your DH tries to pressure or force you into complying with his brother's request, I'd tell him that this could be the end of your marriage.

MaggiesShadow · 20/11/2025 17:57

Your husband is an absolute knob head.

Missingducks · 20/11/2025 18:06

Taking this to the end eventually your DC will need to have two weddings? Nah! Do not indulge any further. Up to you to host one event if you wish. Up to your BIL to work out his own mess.

andthat · 20/11/2025 18:08

Wow. Your BIL is a total cunt.

6 kids with three different women and 2/3 of them don’t know about each other?

if this is real then your entire family is being unreasonable for facilitating this absolute arsehole.

MusicMakesItAllBetter · 20/11/2025 18:11

This reply has been deleted

Message deleted by MNHQ. Here's a link to our Talk Guidelines.

To work out what's going on?

jojobooh · 20/11/2025 18:12

So BIL lives between the two mothers and is back and forth all the time.

OH doesn't tell me an awful lot but I read between the lines.
Personally I believe that BIL is still having sex with both of the women and they each believe that he is in an exclusive relationship with him.

He took himself, the twins and the mother on a cosy Xmas holiday last Xmas - OH was still claiming that they don't sleep together but then let it slip that she takes birth control as she dosent want any more kids.

He took them on holiday at Christmas and told the ex that he was going on holiday with my OH as she kept calling his mum Xmas Day who in turn asked me what was going on!
She still dosent know they went on holiday as a family.

She was also at the 40th birthday dinner this year with the twins and one of the older sons, the 10 and 14 year old were not invited.

It really is a shitshow and so many lies and I really have tried my best to keep my kids out of it but OH dosent see the logic or common sense as it's his brother.

I am going to decline the suggestion of a 2nd party and have strong words with him when he gets back.

OP posts:
WearyAuldWumman · 20/11/2025 18:15

These things always come out in the end.

jojobooh · 20/11/2025 18:18

Missingducks · 20/11/2025 18:06

Taking this to the end eventually your DC will need to have two weddings? Nah! Do not indulge any further. Up to you to host one event if you wish. Up to your BIL to work out his own mess.

This actually made me laugh (even though it's not a laughing matter) as it's the kind of thing that BIL would actually suggest. He 100% would ask this.

He probably will drag this on long as possible and I really think it's because he is in a relationship with both of them.

OP posts:
diddl · 20/11/2025 18:18

So BIL lives between the two mothers and is back and forth all the time.

So they must know what is going on?

Or where do they think he is when not with them?

MusicMakesItAllBetter · 20/11/2025 18:18

Wow what a mess.

You said your OH gets nasty and defensive of his DB @jojobooh are you ok with him getting nasty with you?
Does he do it in front of your child/children?

treesocks23 · 20/11/2025 18:19

jojobooh · 20/11/2025 18:12

So BIL lives between the two mothers and is back and forth all the time.

OH doesn't tell me an awful lot but I read between the lines.
Personally I believe that BIL is still having sex with both of the women and they each believe that he is in an exclusive relationship with him.

He took himself, the twins and the mother on a cosy Xmas holiday last Xmas - OH was still claiming that they don't sleep together but then let it slip that she takes birth control as she dosent want any more kids.

He took them on holiday at Christmas and told the ex that he was going on holiday with my OH as she kept calling his mum Xmas Day who in turn asked me what was going on!
She still dosent know they went on holiday as a family.

She was also at the 40th birthday dinner this year with the twins and one of the older sons, the 10 and 14 year old were not invited.

It really is a shitshow and so many lies and I really have tried my best to keep my kids out of it but OH dosent see the logic or common sense as it's his brother.

I am going to decline the suggestion of a 2nd party and have strong words with him when he gets back.

Edited

Literally no words! And I'm sorry but in your position, I would be questioning my dh's morals as well. Blood isn't always thicker than water and this is just pure wrong on every level and the fact her doesn't see that objectively is highly concerning.

SheilaFentiman · 20/11/2025 18:19

Surely you can’t have either pair of kids to a party as neither pair know and your DC may something??

jojobooh · 20/11/2025 18:19

Sorry I meant he lives in his own house in a town that is between the two mothers.
He turns his phone of when he with one of the mothers so the other dosent call.

OP posts:
MaggiesShadow · 20/11/2025 18:20

@jojobooh I think it's worth reiterating that as bad as BIL and this mess is, your dh sounds absolutely vile and I'd be questioning if I wanted myself and my children around someone who's "nasty" in defense of his gross brother and the way he's messing around his children and these women.

SheilaFentiman · 20/11/2025 18:21

Again - if your OH thinks mother of the middle two kids is so terrible, surely he condemns Dbro for still sleeping with her…?

MCF86 · 20/11/2025 18:22

I was also going to mention that you have, more than once, said your OH gets nasty when defending this shit show.
What does nasty look like?

I can't believe nobody has pointed out to BIL that this just isn't feasible long term!

dapsnotplimsolls · 20/11/2025 18:24

Someone needs a vasectomy.

Zippedydodah · 20/11/2025 18:28

Dontbeme · 20/11/2025 16:27

Are you not the tinest bit worried that your husband, his parents, his siblings and seemingly extended family are all willing to lie and collude to hide affairs and keep children secret? Do you not think that one day you will be on the receiving end of this treatment OP, that your children will be treated like this and lied to? I would be getting out of this shitshow as fast as my size six feet would carry me. Those poor kids being dragged through life by a sexually incontinent waste of skin and his awful family.

Edited

I completely agree, a first class shitshow.
I’d leave them to it, it’s utterly ridiculous, like something from Jeremy Kyle.

jojobooh · 20/11/2025 18:28

OH gets nasty in terms that he talks to me in quite a belittling way, patronises me and raises his voice.

He can actually be quite verbally abusive to me and has a really evil/bullying side to him.

Our relationship is far from ideal/perfect but that is a whole different thread.

I will be talking to him tonight when DC go to bed.

OP posts:
Millytante · 20/11/2025 18:29

pinkyredrose · 20/11/2025 17:51

OH's reasoning is "because the ex is an alcoholic my brother had the right to do what he wanted and it's her fault for making him so unhappy".

Your OH sounds like a right dick. This is a similar line that he'll use on you if he ever cheats on you.

And it sounds like he thinks it’s pretty much part of having married and had children with Woman A, that regular geezers such as himself and his odious brother should get to shag around with Women B-Z as a matter of natural justice. As recompense for playing the marriage game.
(It’s hardly a new mindset, after all. We’d hoped men like these might have evolved a bit in recent decades; but no. Why would they, when others conspire to cover up their lousy misbehaviour?)
EDIT just read yr latest update. That settles it, in my mind.

In your place, OP, I’d be thinking very hard about my future, and more so my children’s, and reminding myself that I probably still have options if I act fast and discreetly enough.

Vaxtable · 20/11/2025 18:29

You have one party. He can decide which kids are invited. If your dh is that concerned he can do the second party on his own

but long term dh and bil are not being fair to your kids who will be caught in the middle of some secret. Bil needs to come clean and the kids meet each other

MaggiesShadow · 20/11/2025 18:35

jojobooh · 20/11/2025 18:28

OH gets nasty in terms that he talks to me in quite a belittling way, patronises me and raises his voice.

He can actually be quite verbally abusive to me and has a really evil/bullying side to him.

Our relationship is far from ideal/perfect but that is a whole different thread.

I will be talking to him tonight when DC go to bed.

Jesus. You have way bigger problems than a trigger-happy BIL. And your kids should have more of your concern than an army of nieces and nephews.