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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:
Terrribletwos · 20/11/2025 19:55

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.

What?! This is way more concerning than your original post @jojobooh !

jojobooh · 20/11/2025 20:00

I'm the one who said to them both "why can't all the kids come together"? And they both accused me "of playing God with the kids".

The only reason I don't think BIL don't want the kids to meet is because he is sleeping and having a relationship with both of them.

BIL is very blunt and if he wanted his kids to meet he is the type of person who would make it happen no matter what the mothers said.

OP posts:
seasid · 20/11/2025 20:00

jojobooh · 20/11/2025 19:49

OH has just called BIL's ex a "crazy woman" and when I have advised him what a weird and messed up situation is he again has turned nasty and started an argument.

He thinks there is nothing wrong with what has happened and thinks the kids will play happy families when they turn 16 and apparently it's BIL's ex's fault they have not met as she is "crazy".

Now he is trying to say BIL told the ex he wasn't happy for years and the relationship was over.
Thats a lie as they lived together in her house.

She threw BIL out when she found out and he came to our house with a bin bag of cut up clothes saying that she had attacked him because he tried to stop her from steering the wheel when he was driving with her and the kids, she had keyed all his car up and there was me feeling sorry him.

OH response to my question when I asked him how he would explain this to our kids was "I will simply say his uncle loves women and sex".

He is truly awful and I know he is bad as his equally awful brother, it's the kids that tie us nothing else.

Edited

I made a comment prior to reading this one, but it feels like emotional abuse runs in that families bloodline. You feel stuck in this and your partner is literally starting arguments with you over you disagreeing with something and he’s trying to manipulate you into being on his ‘side’. BIL literally playing victim after cheating and lying to his partner for years and facing the consequences of his actions - but hey HE is the victim and his ex is just ‘crazy’. These abusive men love to call their ex crazy and play victim themselves and unfortunately people believe this little act. I bet there’s so much more the ex SIL has been through from this man that none of you know about.

but from my perspective, your partner seems scary and the fact you can’t speak out without him turning it into an argument and invalidating how you feel and trying to make you out to be a problem for feeling that way. Please stay safe, because him speaking about his brother that way and seeing it as normal - how do we know that he wouldn’t do the same to you, or hasn’t done already?

Arlanymor · 20/11/2025 20:05

Oh my goodness - so sorry to read your update. I agree, he is truly awful. I also think that you are right, that your BIL is trying to keep his cheating secret and so the kids have to suffer because he's a selfish wanker.

What's all this bollocks about happy families at 16? The eldest daughter is 16 in under two years isn't she? Does it have to wait until the twins are 16? That's not for another eleven years - by which time she will be 27!

All of this is utterly indefensible. I am so sorry that you are in the middle of it. This is honestly the type of thing that would cause me to leave a relationship if my partner genuinely thought it was fine to defend his brother like this and lie to innocent children.

TrippingOverMyAssets · 20/11/2025 20:15

jojobooh · 20/11/2025 20:00

I'm the one who said to them both "why can't all the kids come together"? And they both accused me "of playing God with the kids".

The only reason I don't think BIL don't want the kids to meet is because he is sleeping and having a relationship with both of them.

BIL is very blunt and if he wanted his kids to meet he is the type of person who would make it happen no matter what the mothers said.

Are they both off their heads? The ones playing god are the ones who are going to spend forever trying to prevent the children finding out. I truly hope they do hate him when the find out. They must both be idiots if they think this is never going to hit the fan. But what about you OP? Why do you even entertain this pair of halfwits?

MissDoubleU · 20/11/2025 20:19

Leave your horrible DH. That’s the only advice that matters. Get out of this circus.

CryptoFascist · 20/11/2025 20:51

What a trash family.

themerchentofvenus · 20/11/2025 20:52

@jojobooh your DH sounds just as unhinged as his brother!

Personally I'd be telling him to play no part in this ridiculous situation or you'll leave.

I would accidentally get drunk next time the older two are round and let slip about the twins to them!

CombatBarbie · 20/11/2025 21:48

No good will come from this situation. Your DH and his brother are abusive arseholes.

GingerBeverage · 20/11/2025 22:07

What’s their dad like (grandpa)?

jojobooh · 20/11/2025 22:13

Unfortunately their dad passed away 5 years ago during Covid.

He left when OH was 18 month old and their mom was pregnant with BIL and then had another baby 2.5 years later with another woman.

BIL has often blamed his issues with women on their late father as he was never really around until they were older.
When I asked him once if he would ever get married he replied "Never and my dad is to blame for that".

They both have a lot of deep routed issues.

OP posts:
MissDoubleU · 20/11/2025 22:39

jojobooh · 20/11/2025 22:13

Unfortunately their dad passed away 5 years ago during Covid.

He left when OH was 18 month old and their mom was pregnant with BIL and then had another baby 2.5 years later with another woman.

BIL has often blamed his issues with women on their late father as he was never really around until they were older.
When I asked him once if he would ever get married he replied "Never and my dad is to blame for that".

They both have a lot of deep routed issues.

Plenty people without fathers choose to be half decent people. He’s a grown adult and responsible for his own growth, healing and development. So no, not buying this pathetic excuse for one minute.

TrippingOverMyAssets · 21/11/2025 01:06

jojobooh · 20/11/2025 22:13

Unfortunately their dad passed away 5 years ago during Covid.

He left when OH was 18 month old and their mom was pregnant with BIL and then had another baby 2.5 years later with another woman.

BIL has often blamed his issues with women on their late father as he was never really around until they were older.
When I asked him once if he would ever get married he replied "Never and my dad is to blame for that".

They both have a lot of deep routed issues.

Like taking personal responsibility, apparently.

InterestedDad37 · 21/11/2025 01:21

How idiots like these brothers ever get female partners is beyond me. Get both of them out of your life! Morons, both of them.

Sunshinesmon · 21/11/2025 07:25

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.

Wow, so he's told you, in words, to your face, exactly what he'll do if things get less than perfect between you two.

diddl · 21/11/2025 07:59

BIL is very blunt and if he wanted his kids to meet he is the type of person who would make it happen no matter what the mothers said.

That's hardly a surprise.

If he has his own place & sees his kids it's not as if it's an impossibility!

SugarPlumpFairyCakes · 21/11/2025 08:38

Urgh. What a mess.

Why are you enabling Bil’s secrets? Nasty little man, isn’t he?

catlover123456789 · 21/11/2025 18:01

Oh wow this sounds so messy, all of it, including your own partner.

Festivespirit85 · 21/11/2025 18:05

jojobooh · 20/11/2025 16:19

The oldest two kids are early 20s (BIL was 17 when he became a dad).
They didn't see their dad for years and the kids lived with their mum and grandparents.

BIL came back into their lives when they were 12 and 13.
They have serious daddy issues.

They have been involved in stabbings, drugs and one is currently incarcerated for a stabbing.
BIL used to go clubbing with them and allow them
to smoke marijuana.

The 10 and 14 year old's have witnessed domestic abuse, their mom is an alcoholic which is apparently one of the reasons why BIL had an affair apparently.

It is very unfair on the kids.

I have tried to approach this with OH but he gets nasty and very defensive of his brother.

Your BIL is horrendous isn't he! It sounds like chaos follows the man about! It's the children I feel sorry for

Festivespirit85 · 21/11/2025 18:08

Folk blaming the OP are our of order! She's said what a cunt the man is! Imagine a grown woman telling to children about their father, like some spiteful witch! It's not her place to tell them, nor is she enabling it. It's the parents and siblings that are enabling it by not making him speak to his children.

Soontobe60 · 21/11/2025 18:18

jojobooh · 20/11/2025 14:53

I don't agree with any of this.
It is very unfair on the children involved.

By saying DC are clever - I meant that eldest DC is aware they they are all his cousins and in the future could accidentally let the secret slip in future.

Everyone in the family knows about the twins it's just BIL's middle children (10 and 14 year old) who aren't aware.

We treat them all the same and OH makes a big effort with both sets of kids.

So you’re all lying by omission to these 2. When they do eventually find out - and they will - they will feel incredibly let down and hurt. Is your BIL your DHs brother? Who does he now live with? Does his ex know about the twins?

OneDaringLurker · 21/11/2025 18:24

You have enabled him by having contact with younger children and not saying. So you are part of the web he built. All he is doing is extending that web. And since you all have assisted, he feels he can carry on with it. Why should he change when its all be made so comfortable for him?

TheFormidableMrsC · 21/11/2025 18:35

They both seem to blame everybody except themselves for the fact they are a pair of absolutely inadequate arseholes 🤷🏻‍♀️

Hons123 · 21/11/2025 18:37

Disgusting

oldmoaner · 21/11/2025 18:38

I know this may be a long time away. But what happens if BIL was seriously ill or died? Would he have to limit his children visiting him so they dont meet? Or have 2 funerals? But that wouldn't be his concern as he wouldn't have to deal with it. Id tell him to get a backbone, sit kids down and explain. They're half brothers and sisters they've done nothing wrong HE has, so time he manned up faced up to what he's done And. Bloody sort it out. I take it his partner knows or is it a secret from her as well?

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