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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

DP’s son moving in

936 replies

maximusss · 23/01/2026 07:42

I suspect I’m being unreasonable here but I thought it would be helpful to get other people’s opinions.

My DP has a DS19, sees him usually once a week when he comes to stay.

We’re due to exchange on a house next week and last night DP dropped in to conversation over dinner that his DS will be moving in full time when we are in the new house.

Now I know this is his son, and I like him, but AIBU to think there should have been slightly more discussion on this? I worry about what else he will drop on me without notice or discussion further down the line. Maybe it’s me being dramatic, it’s just made me feel a little uneasy for some reason.

OP posts:
NoisyViewer · 23/01/2026 17:27

Miyagi99 · 23/01/2026 17:23

To be fair I think it’s an unwritten agreement that your child can always move home if they need to isn’t it? As long as they are no underlying issues. Wouldn’t even cross my mind to ask my partner. Discuss yes I suppose but it would never be a no from me and my child is now an adult.

i agree, I wonder what the opinion would be if he kicked off because her child dropped out of uni & all of a sudden needed to come home. Would everyone be criticising her to expect to house her child? I doubt it

sittingonabeach · 23/01/2026 17:29

If before you move in with someone and you discuss the fact that new house is home for DC (both yours and partners), if adult DC then says I need to move in on a more regular basis (so not just once a week or uni holidays) how much more discussion can there be apart from house rules, rent etc. you’ve already agreed it is their home. If the partner’s DC was the one at uni would it be right for OP to say no can’t come here in holidays, or after uni.

BillieWiper · 23/01/2026 17:32

How crazy he didn't even discuss it. You must have had discussions about what each of the bedrooms would be used for?

Unless there's some horrific breakdown of relations in his other home I'd be saying the arrangement remains the same. And I'd be furious he thought he could just make the decision so casually.

Jaichangecentfoisdenom · 23/01/2026 17:49

I really hope you have called the solicitors to pause the progress, @maximusss. I must say, if I were you, I would not be going ahead with this joint purchase, as others have said, there are red flags a-plenty and I think you would be the loser in this whole situation. The idea was for you and your partner to live together, not for you both to blend families and have all your children come and live with you and for you to be their unpaid housekeeper.
Good luck!

NoisyViewer · 23/01/2026 17:56

londongroom · 23/01/2026 16:32

"How often the girlfriend would be there (he sees her every day)
Whether he’ll be allowed to smoke weed in the back garden."

and how much he will be contributing alone will be a biiiiig factor i would say no if i was you.

She has to remember that she also has a child that’s very likely be coming home full time in a few years & uni they have nearly 4 weeks off at Christmas and finish may/june and return October. She doesn’t have to contribute & the son should pay his way as he’s working but I’m sure she’ll appreciate help when it comes to feeding & housing hers

euff · 23/01/2026 17:57

Going away from the point here but if you do go through with the purchase how will you be owning the property, joint tenants or tenants in common?

As for the actual point I do find it weird that conversations about the possibility of very young adults wanting to live with you or spend a lot of time there haven’t happened as well as decisions about bedrooms etc. I don’t think it’s unreasonable to not want to live with a 19 year old who isn’t your own and may still behave like a child. I wouldn’t expect my DC to financially contribute to my home in teens or early 20’s unless I needed it but I would want the saving.

hahagogomomo · 23/01/2026 17:59

It’s how the cookie crumbles. First either of us knew about dh’s dd coming to live with us was his ex calling us on a Friday telling us she would be moving in on Saturday afternoon, didn’t even ask if we would be in (dsd had a key) dsd was 19. All was fine but no you have accept it as its his child

HappyFace2025 · 23/01/2026 18:02

hahagogomomo · 23/01/2026 17:59

It’s how the cookie crumbles. First either of us knew about dh’s dd coming to live with us was his ex calling us on a Friday telling us she would be moving in on Saturday afternoon, didn’t even ask if we would be in (dsd had a key) dsd was 19. All was fine but no you have accept it as its his child

No she doesn't have to accept it. Her DP hasn't involved her at all in what is a major change to their circumstances just as they are about to exchange contracts on a house. A different situation from yours.

ThejoyofNC · 23/01/2026 18:03

hahagogomomo · 23/01/2026 17:59

It’s how the cookie crumbles. First either of us knew about dh’s dd coming to live with us was his ex calling us on a Friday telling us she would be moving in on Saturday afternoon, didn’t even ask if we would be in (dsd had a key) dsd was 19. All was fine but no you have accept it as its his child

Erm no, it's an adult. You may let other people make your choices for you but I don't suggest op does the same.

Jaichangecentfoisdenom · 23/01/2026 18:04

canuckup · 23/01/2026 15:33

Honestly op: woman up.

You're about to buy a house, and another adult will be living in it, and you think you don't have a choice???

another adult will unexpectedly, at extremely short notice but as a fait accompli be living in it - of course you have a choice. Stop the purchase now.

sittingonabeach · 23/01/2026 18:07

@ThejoyofNC so if the DD wants to live in the house during uni holidays, after uni or if a situation arises eg health so needs a break from uni it would be fine for the partner to say no.

ThejoyofNC · 23/01/2026 18:09

sittingonabeach · 23/01/2026 18:07

@ThejoyofNC so if the DD wants to live in the house during uni holidays, after uni or if a situation arises eg health so needs a break from uni it would be fine for the partner to say no.

Yes. Decisions like that need to be discussed and mutually agreed. If they cannot agree then they cannot live together.

ruethewhirl · 23/01/2026 18:10

NoisyViewer · 23/01/2026 14:30

he told you pretty much straight away then. I’m going to get a lot of hate but if this was my son wishing to live with me I would discuss it with you but it I wouldn’t be looking for permission. My children will have a roof over their heads as long as I have one over mine. He only just found out himself and he’s told you. You can discuss house rules and worries but if you don’t want to live with his son then there are 2 options. Pull out the sale and live apart or split up. This would be the only negotiation someone would be having with me

He has a roof over his head. With his mother. He's looking to move presumably because he thinks his dad will be more of a soft touch. It's not exactly like he's going to end up sleeping on a park bench if he can't move into his dad's.

bigboykitty · 23/01/2026 18:10

It's not too late to cancel the exchange on Monday. They will call on the day to confirm that OP and her shit partner are happy to proceed with the exchange.

bigboykitty · 23/01/2026 18:11

sittingonabeach · 23/01/2026 18:07

@ThejoyofNC so if the DD wants to live in the house during uni holidays, after uni or if a situation arises eg health so needs a break from uni it would be fine for the partner to say no.

Don't be silly. OP said they've already discussed and agreed this. Because OP isn't a twat.

thankfulnessisnotbizarre · 23/01/2026 18:15

would be a total NO from me.

MO0N · 23/01/2026 18:15

sittingonabeach · 23/01/2026 18:07

@ThejoyofNC so if the DD wants to live in the house during uni holidays, after uni or if a situation arises eg health so needs a break from uni it would be fine for the partner to say no.

The partner wont need to say no, he'll let his son + gf do as they please and she wont want to live there.

thankfulnessisnotbizarre · 23/01/2026 18:16

Just pull out and stop pandering to these step mum situations. Enough is enough, women will do everything for a man's cock, fed up seeing this nonsense

Silverbirchleaf · 23/01/2026 18:17

sittingonabeach · 23/01/2026 18:07

@ThejoyofNC so if the DD wants to live in the house during uni holidays, after uni or if a situation arises eg health so needs a break from uni it would be fine for the partner to say no.

I presume there would be discussion before this happens, and uni holidays have already been discussed. It’s not quite the same as telling your dp that your weed- taking, possibly messy (why his mum means?) son (and girlfriend) are moving in.

Buying a house for three full- time adults is different to two-adults and guests. Apart from anything, nothing has. Been discussed about finances. Is the son going to pay a third of all bills etc. or will op be expected to pay 50:50, so subsidising him?

sittingonabeach · 23/01/2026 18:18

@bigboykitty so when they had that discussion why didn’t the discuss the possibility of his son treating their house as home. At the very least he was still going to be staying one day a week, so how was girlfriend and smoking weed going to fit in then?

bigboykitty · 23/01/2026 18:20

sittingonabeach · 23/01/2026 18:18

@bigboykitty so when they had that discussion why didn’t the discuss the possibility of his son treating their house as home. At the very least he was still going to be staying one day a week, so how was girlfriend and smoking weed going to fit in then?

I'm afraid I can't answer for the useless prick. I don't know him. Obviously.

cartagenagina · 23/01/2026 18:21

hahagogomomo · 23/01/2026 17:59

It’s how the cookie crumbles. First either of us knew about dh’s dd coming to live with us was his ex calling us on a Friday telling us she would be moving in on Saturday afternoon, didn’t even ask if we would be in (dsd had a key) dsd was 19. All was fine but no you have accept it as its his child

But OP doesn’t live with this man.

She has the opportunity to avoid the situation if it doesn’t suit her.

Millytante · 23/01/2026 18:21

Miyagi99 · 23/01/2026 17:23

To be fair I think it’s an unwritten agreement that your child can always move home if they need to isn’t it? As long as they are no underlying issues. Wouldn’t even cross my mind to ask my partner. Discuss yes I suppose but it would never be a no from me and my child is now an adult.

There seem to be plenty of underlying issues with this son though.

Livpool · 23/01/2026 18:22

Snoken · 23/01/2026 08:03

I think you always have to take into consideration that you might end up living with their child if you decide to live with someone who has a child. Not many 19 year olds live independently these days, unless they are away at uni, so it's not completely unexpected. A heads-up would have been great though but it doesn't sound like your partner got one either and he can't really tell his son that he isn't allowed to live with him. I think you need to tread a bit carefully with this one, if I was about to move in with a partner and he said my child wasn't allowed to live with us I'd reconsider the whole relationship.

You can of course pull out of the purchase, but also, his son might just be living at home for a year or two.

Completely agree with this!

Tinyfrog200 · 23/01/2026 18:29

This is very unfair. Why doesn’t his Son apply for his own flat? He’s working after all.

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