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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Partners adult child just introduced new born baby to MIL, we had no idea

89 replies

Starsnsprinkles · 21/12/2025 16:59

Well technically not my MIL, as not formally married but my partner and I have been together for ever. His relationship has never been "healthy", kids never contact him to say hi or thank him for gifts. They are in there late 20's now but have maintained a relationship with my partner's mum. MIL just rang to say ones turned up on her door step with my partner's ex wife and a 10 week old baby. No one had any idea they were expecting.
Last contact was a text from said adult child saying "I think your a c**t" to my partner it really hurts him, we did not reply. Then heard from sibling they had mental health issues. Now this. MIL was giddy with excitement at meeting her great grandchild but we are dumb founded. I'm gutted for my partner, I don't know what to do (care kid with no bio family so no idea how families deal with this)
I want to at least send money but time of year, no address, partner has just lost job and I'm the only wage. I'm heartbroken
Is this non of my business? Should I step in? My partner is a lovely man but has issues expressing himself (autistic as am i) the pain is palpable. Can I even do anything to help?

OP posts:
GAJLY · 21/12/2025 19:15

outerspacepotato · 21/12/2025 17:28

Your partner is estranged from his kids and you can't fix this. Stay out of it.

Agree with this 👆

Moonlightfrog · 21/12/2025 19:16

bigboykitty · 21/12/2025 17:56

OMG is there no end to the number of women who rock up here feeling desperately sorry for their 'poor partner' whose children won't see him and treat him like crap. My adult kids don't see their dad. It's because he's been an utter cunt their whole lives. His girlfriend feels so sorry for him 🙄. Stay right out of it OP.

Totally this. His children don’t want to see him for a reason. Sorry OP but my parents would have had to do something pretty major for me to not want contact with them.

I would stay out of it, but in my head I would seriously be questioning how his children got to a point where they didn’t want to see him and why they call him a c#nt.

Catza · 21/12/2025 19:50

TangoWhiskeyAlphaTango123 · 21/12/2025 17:43

When women come on here and say they are with a man that is estranged from their adult children I cannot help but think they are probably the ones at fault for the relationship breakdown. If they are estranged then there is no reason why he would have been told as hurtful as it is for him. I would not do not send money or do anything here - leave them be.

My thoughts too..
In fact my cousin had a baby this year and he hasn't told his father or his paternal grandmother about it. Father buggered off when my cousin was 3 because he got his side chick pregnant. That's not quite the grandfather they wanted for their baby.

MrsJeanLuc · 21/12/2025 20:14

AwfullyGood · 21/12/2025 17:15

Don't know why anyone would have a relationship with a man who doesn't have a good relationship with his kids.

It's not going to change now.

And that was supposed to be helpful?

My mum used to say "if you can't say something nice don't say anything at all"
HTH

AwfullyGood · 21/12/2025 20:26

MrsJeanLuc · 21/12/2025 20:14

And that was supposed to be helpful?

My mum used to say "if you can't say something nice don't say anything at all"
HTH

Yes actually it was.

It provide a clear outline of why OP find herself with this query. (The first sentence).

It also sign posts what's like to happen from here on. (The second sentence).

If you have any further enquiries, please hestitate to quote me again.

Booboobagins · 21/12/2025 20:26

How awful to be estranged from his kids, but it happens.

Your DP needs to decide what to do, anything you do may be seen as interfering I'm afraid.

I hope it all works out and you do get to see and have a relationship with the baby.

VeterinaryCareAssistant · 21/12/2025 20:28

NearlyMonday · 21/12/2025 17:08

Sorry, I can’t work out who has had a baby?

Can you not read?

VeterinaryCareAssistant · 21/12/2025 20:35

Snoken · 21/12/2025 18:08

Same here. My young adult kids don’t have anything to do with their dad either because he’s shit. He still he managed to find a woman a few months after we separated and they had a child asap because quite frankly they were both too old so had to rush it. Now the baby is here and they are so upset that our kids don’t have a relationship with their new half-sibling who is 20 years younger than them. I think my kids would absolutely hate it if their dad’s new girlfriend started meddling, she wouldn’t have been told the ins and out of their complex relationship.

It's not your children's sibling's fault that he/she exists. Why would they not want a relationship?

Sartre · 21/12/2025 20:38

Sounds complex. I’m always sceptical when adult children don’t speak to their parents just because I know there’s pretty much always a big backstory there and the parents tend to claim they don’t understand why.

Homegrownberries · 21/12/2025 20:40

They don't want you involved. Stay out of it.

Coconutter24 · 21/12/2025 20:43

Children don’t just go no contact with parents for no reason, stay out of it

Snoken · 21/12/2025 20:46

VeterinaryCareAssistant · 21/12/2025 20:35

It's not your children's sibling's fault that he/she exists. Why would they not want a relationship?

Because they don’t don’t want a relationship with their dad and didn’t even know he had a new girlfriend or that he had made anyone pregnant. They also live in different countries and my kids are in their early 20s whilst their sibling is a baby. I doubt they will ever feel or act like siblings, but that’s on their dad who decided to keep it all a secret.

converseandjeans · 21/12/2025 20:47

It sounds like they are in touch with their grand mother - this is totally normal. Perhaps the ex partner has known the (ex) in laws for years & kept in touch due to the children seeing them once their parents split.

I can’t work out why his child would send him a nasty text calling him unpleasant names. Do you know why they would do this?

PrincessFairyWren · 21/12/2025 20:56

converseandjeans · 21/12/2025 20:47

It sounds like they are in touch with their grand mother - this is totally normal. Perhaps the ex partner has known the (ex) in laws for years & kept in touch due to the children seeing them once their parents split.

I can’t work out why his child would send him a nasty text calling him unpleasant names. Do you know why they would do this?

I can’t work out why his child would send him a nasty text calling him unpleasant names. Do you know why they would do this?

Probably because they were hurting at that exact moment and felt like lashing out at someone who ignores them. And the DP ignored their text. I'm not saying it's nice but generally people say that when they are hurt.

Jk987 · 21/12/2025 21:20

There must be a reason your partner is estranged from his child. What sort of a father was he when the child was young?

DollarsSign · 21/12/2025 21:25

AwfullyGood · 21/12/2025 17:15

Don't know why anyone would have a relationship with a man who doesn't have a good relationship with his kids.

It's not going to change now.

Sound like adult kid(s) may have issues if their grandmother(MIL) also didn’t know about this.

mindutopia · 21/12/2025 21:44

Being autistic isn’t an excuse for being a crap dad. My stepdad apparently sexually abused his children because he’s autistic and ‘misread social cues’. 🙄 Nah, it doesn’t work like that. Lots of fantastic autistic parents who are lovingly engaged in parenting their children. This is his wound to heal though. You stay out of it. The last thing any new parent wants is the dad they don’t want around turning up when they should be enjoying time with their new baby. If they wanted you in their lives, they would have reached out.

Silverbirchleaf · 21/12/2025 21:50

Can you send a ‘congratulations’ card and a gift for the baby?

Catpuss66 · 21/12/2025 21:58

Thundertoast · 21/12/2025 17:19

OP, either your partner isnt being honest with you about the backstory or you arent being honest here...

Or adult child been given untrue back story.

InsomniacA · 21/12/2025 22:59

OP, were you involved with this man when he was still with the children's mother?

Theslummymummy · 21/12/2025 23:05

I'm wondering why they think he's a cunt

bigboykitty · 21/12/2025 23:07

VeterinaryCareAssistant · 21/12/2025 20:35

It's not your children's sibling's fault that he/she exists. Why would they not want a relationship?

It's blindingly obvious why they wouldn't!

bigboykitty · 21/12/2025 23:10

Silverbirchleaf · 21/12/2025 21:50

Can you send a ‘congratulations’ card and a gift for the baby?

Jesus, don't do that!

FenceBooksCycle · 21/12/2025 23:10

Stay out of it. If the young mum had wanted her dad involved she could have arranged it. She really really doesn't need her dad's girlfriend involved.

bigboykitty · 21/12/2025 23:10

Catpuss66 · 21/12/2025 21:58

Or adult child been given untrue back story.

Oh that old chestnut.