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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:
Purplecatshopaholic · 23/01/2026 09:49

Uhghg · 23/01/2026 09:31

Why does it need to be discussed?

There is always the potential that you have your child come and live with you.

There are hundreds of childless people out there - be in a relationship with one of them instead.

I have drilled it into my DD that she will always have a home at mine and if she ever needs to leave her home then she can turn up at mine no matter if it’s the middle of the night.
I don’t care if she’s 40 with 3 kids or 23 and 0 kids.

At 19, I would 100% have my DC live with me.
If my DH didn’t like it then he needs to leave and I wouldn’t want to be with someone like that anyway.

Why does it need to be discussed? Err, look at the numerous posts on this thread. You may be happy with your adult children moving (back) in, but a new partner might not be and would surely deserve the respect of a discussion around it. Would never have occurred to me to just tell my mum I was moving back in with her in the first place, particularly not if she was on the verge of buying a property with a DP.

ByQuaintAzureWasp · 23/01/2026 09:48

Questions:
How much is he contributing financially to water, gas, electric, council tax, wifi, household basics?.
Will he be cooking and cleaning up after himself?
Will his girlfriend be staying? How often?
What will the ground rules be for son?
What will he contribute to cleaning/maintaining g a nice home?
Who will do his washing and ironing?

Clemdfandango · 23/01/2026 09:48

Your DP is out of order for not discussing this with you.

Before my DH and I bought our first house together, he asked me how I would feel if either of his two (then) teenage children wanted to live with us. I asked him how they would feel about living with me.

It never happened. I'd had no part in their upbringing and only saw them occasionally, so I certainly didn't want to live with virtual strangers.

You have to make your feelings clear to your DP before the son moves in to your space.

IsItSewEasy · 23/01/2026 09:47

Yikes. Can you pull out? How disrespectful. Ds sounds a nightmare.

TightlyLacedCorset · 23/01/2026 09:46

You are not unreasonable to be annoyed and even questioning of future communication problems if your DP just dropped this on you without discussion. That's very autocratic. If you want to reassess your relationship along those lines that's perfectly valid.

But you knew he had a child. Just because a child is 19, doesn't mean he will be completely self reliant, especially with things being so tough for young people, with rents being ridiculously expensive, house prices often out of reach and one of the most difficult job markets for even young talented post graduates. I have two young twenty somethings still at home saving for their first home. I unfortunately cannot provide them a deposit so this is my way of helping.

It's unreasonable of you to object to this man wanting to provide a similar landing place for his son. Though I will say, it is very typical that SP men do not put their children front and centre in discussions when they embark on new relationships. They often treat them as background objects, then it all goes pear shaped when the new partner realises they will actually be a main feature.

No parent should tell their child they have to consider what their partner says first before they can live with them. You should both already be onboard about ALL the children you have between you and the relationship with all the kids should be of a decent enough standard that the child knows in the event of a crisis there is a place they can land at least temporarily without feeling like an unwelcome burden. Of course if they can contribute they should and should want to if they've been raised properly.

This is why a lot of these relationships where people have separate children with othersdo not work. They have put the kids away in their minds.

I think you should end it. The communication is bad, and I don't see things working out for all concerned. Definitely do not buy the house you will resent it.

OlderGlaswegianLivingInDevon · 23/01/2026 09:45

I expect your partner is now going to be paying a larger portion of the mortgage as he is having another adult to live in the joint home.

Obiv all the bills will be 33.3% each adult living in the home...

There is a lot of discussion to take place before exchange !

WhatATimeToBeAlive · 23/01/2026 09:45

Wow, I would be fuming. Why doesn't the son move in with your DP now? Why wait until you get a house together? Maybe he'd get a taste of how he actually lives and why his ex "moans" at him. You're right, it's the lack of discussion about another adult moving in with no regard for you. I would back out - it's not a great way to start the new phase of your life together and there is instant resentment there.

Angrybird76 · 23/01/2026 09:44

Uhghg · 23/01/2026 09:31

Why does it need to be discussed?

There is always the potential that you have your child come and live with you.

There are hundreds of childless people out there - be in a relationship with one of them instead.

I have drilled it into my DD that she will always have a home at mine and if she ever needs to leave her home then she can turn up at mine no matter if it’s the middle of the night.
I don’t care if she’s 40 with 3 kids or 23 and 0 kids.

At 19, I would 100% have my DC live with me.
If my DH didn’t like it then he needs to leave and I wouldn’t want to be with someone like that anyway.

Of course it needs to be discussed. I covered it in in my previous post but:

  • What is the agreed stance on rent
  • What is the agreed stance on chores (especially as there already is a messiness issue)
  • what is the agreed stance on girlfriend
  • What about coming in late at night
  • How do you deal with issues if boundaries are crossed.

And probably more. When my DP and i moved in together with my DC we talked about all of that and more and mine was 11! we even talked about all the above and we werent there yet. As a courtesy he should have discussed this with the OP and its very concerning that he didnt.

gamerchick · 23/01/2026 09:44

Screw that, I'd really consider pulling out. If he's capable of landing these decisions on you with no discussion the. It won't be the only thing. He obviously sees it as his house.

Lilactimes · 23/01/2026 09:42

Hi @maximusss

I think if you both had adult kids it's understandable they could come back at some point. And if you're committed partners with a potential joint house then it's likely to happen and need to be accepted.

when I read your post, though, I just wanted to shout Noooooo don't do it.

Ive recently moved house and my DN lives with me as has been kicked out by his mum for same reasons. He's same age and is so messy and smokes weed. HE has no where else to go and has recently lost his job.
It's very difficult and is putting a huge strain on my household.

Your DP can look after his son in his place - but if I were you I would want to keep my bolt hole of my own space ... just in case the pressure becomes too much.

Happyjoe · 23/01/2026 09:41

It's not the son moving in per se, it's the lack of respect towards you in asking for your opinion and asking for you to come to an agreement. This is huge.

I'd not exchange if it were me tbh, not until any issues have been resolved and you trust him going forward.

Oopsylazy · 23/01/2026 09:40

Emptyandsad · 23/01/2026 09:33

The outcome could be "I don't want to live with your son, so we shouldn't buy a house together"

That would be a perfectly reasonable position to take.

If the OP wants to explore the option of the son moving in, she needs an open and honest chat with her OH and then the three of them need to sit down together so that everybody knows exactly how things should work. In the three way discussion, OP will get an idea of how her DP is going to stick up for her in the house in the years (!) to come

This.

OP - this is going to be a huge change for you presumably at a time in your life when your dd has gone off to uni and you are able to please yourself and move in with your dp. For him to dump it in your lap that you’ll now have his ds living with you who’ll be around every single day (and probably his gf too) is just plain wrong and obviously changes everything. You sounds very passive and nice and I’m thinking you’ll go ahead to keep the peace and sleepwalk into a very bad situation.

It’s ok for you to not be ok with this and if your dp loves you he will understand and see that a joint house purchase probably isn’t the best thing right now and his responsibility is to his ds, if that’s what he decides. Just stay in your separate properties for now.

LightDrizzle · 23/01/2026 09:40

Has your partner's house always been the weekend house for his son? I think that adds to the risk that he sees dad's as the chill, “fun” house which bodes ill for this setup. The worst case scenario is finding yourself “nagging” two eye rolling and resentful men and feeling like Nanny Fucking McPhee in your own home.

Theeyeballsinthesky · 23/01/2026 09:39

C152 · 23/01/2026 09:38

I didn't read that poster's quote that way. I took it to mean that it's important to have these conversations before moving in together, let alone buying a house together, because the answer could mean the relationship isn't actually suitable long term. It is perfectly acceptable for a person not to want to live with their partner's adult child. As a parent, it's also acceptable to say your child, no matter their age, will always have a home with you. But if it's not clear what the red lines are in the relationship, then it's far too soon to be buying 50% of a property together.

Exactly that

sittingonabeach · 23/01/2026 09:39

@maximusss assume you would have the same house rules as you would for your DD

C152 · 23/01/2026 09:38

Uhghg · 23/01/2026 09:33

So if OPs DD left uni and wanted to go and live with her mum - you’re saying it’s ok for DP to refuse - even though it’s OP’s DD??

I am shocked how many people would put a relationship over their own kids.

If any man said my DD wasn’t welcome to live in our home then I’d be gone.

I didn't read that poster's quote that way. I took it to mean that it's important to have these conversations before moving in together, let alone buying a house together, because the answer could mean the relationship isn't actually suitable long term. It is perfectly acceptable for a person not to want to live with their partner's adult child. As a parent, it's also acceptable to say your child, no matter their age, will always have a home with you. But if it's not clear what the red lines are in the relationship, then it's far too soon to be buying 50% of a property together.

ProbablybeingU · 23/01/2026 09:38

I would pull out.

He’s allowed to want his son to move in with him but the complete lack of discussion and the springing this on you is a very big red flag of signs to come. The thinks it’s his house, his rules and you should just follow.

Picklelily99 · 23/01/2026 09:37

So he'll now be messy in YOUR new home? Ooh, no thanks. I'd be tempted to leave the pair of them to it, father and son, and see how long dad puts up with 'messiness'? Don't now be rushed into making snap decisions, and accepting things you haven't had time to process.

OneCheekyCat · 23/01/2026 09:36

He definitely should have discussed it, no argument there.
However, he has a son and you have a daughter. How can you say no to his child but expect your child to live with you after uni. You say she probably won't, but you can't know that.
Put down house rules for BOTH children and make no differences.

OhDear111 · 23/01/2026 09:36

Op. DDs at university come home after graduation in many cases. I’m beginning to think you should keep your own home!

Uhghg · 23/01/2026 09:36

maximusss · 23/01/2026 09:31

Again, it’s not about living with his son, I like him. It’s about

The lack of discussion about it when we’re both paying 50/50 for the new house

No mention of his son contributing financially when he works full time

How often the girlfriend would be there (he sees her every day)

Whether he’ll be allowed to smoke weed in the back garden.

This move has been prompted by his son leaving his mums as he was messy and his mum had enough!

Are you unable to use your words?
Did you just sit in complete silence?

You said he was talking to you about bedrooms etc - literally trying to have a discussion with you.

But a discussion does require you contributing as well.

Emptyandsad · 23/01/2026 09:35

sittingonabeach · 23/01/2026 09:32

@Emptyandsad same can be said for when OP’s DD is in the house when home from uni. Why haven’t these discussions been had? If the DC were in their 30s it would be different but they both have 19yos, most 19yos would still view this house as somewhere they could live, even if only part-time.

My parents moved when I was at uni, there was still a bedroom/home for me at the new house.

Absolutely right. All these things should have been discussed at great length

The complete lack of communication in so many relationships is astounding. People find it easier to come on here and ask strangers on the Internet than they do to talk to the person that they love and who loves them

Mind blown...

BufferingAgain · 23/01/2026 09:35

Judging by the previous Mumsnet playbook in six months you’ll be on your hands and knees cleaning up after both father and son, wondering how you ended up as their servant.

I would try to rent with this person first before becoming so financially entangled with a joint mortgage. Or perhaps continue to live separately for a few years until both kids have properly flown.

FOJN · 23/01/2026 09:34

Uhghg · 23/01/2026 09:23

OP has already said that she assumes DP would allow her DD to move in with them FT.

This is what she actually said. She makes it clear that it's the lack of discussion rather than the son living with them.

Yes I completely get that in 2 years time they may come back (although I’d be surprised as they love not living at home!). For me it’s more the lack of discussion on something so big than his son actually being there.

OhDear111 · 23/01/2026 09:34

@redboxer321 Why? The op is reasonable to say these things are a problem. They totally are! I’d be very cross with no consultation and my future being compromised. It’s not what she expected so why is it a wind up?