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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:
MangaKanga · 24/01/2026 04:06

How are you going to own the house? If you proceed I hope it is as tenants in common, so your own children will receive your share if you die before your husband. Otherwise I can foresee the son moving in... you dying first... and the son just living there forever.

What else will you be "told" in the future though? What new carpet, new motor, holiday you are having? Lodger? That he has invited 10 in-laws for tea and you will be cooking for them?

I would NOT buy a house with this man.

MangaKanga · 24/01/2026 04:14

Also. I wouldn't have a fucken weed smoker in my house, full stop- for a visit, let alone lodged there. He moves in, he'll be like shit on the proverbial blanket. Never to be dislodged

Don't be a mug

RelishingGrpSupport · 24/01/2026 04:24

Fenchurk · 23/01/2026 07:49

Pull out of the new house. It’s not up to you to house this adult.

Agree!

Twiglets1 · 24/01/2026 07:06

maximusss · 23/01/2026 07:51

I think it’s more because I feel I’m being unreasonable to say no - it’s his son after all!

You’re not being unreasonable to think you should have been consulted before this very big decision was made.

Yes it’s his son but not your son and if you are buying the house as equal partners why does one partner feel they can just invite someone else to live there without any discussion at all? It’s a big red flag that your partner doesn’t respect you. I would be rethinking the whole idea re buying a place together.

Twiglets1 · 24/01/2026 07:06

maximusss · 23/01/2026 07:51

I think it’s more because I feel I’m being unreasonable to say no - it’s his son after all!

Duplicate post.

Cassan · 24/01/2026 07:14

it makes perfect sense to me that the dad is delighted for his son to live with him - he missed the opportunity when the son was growing up. It also makes sense why you wouldn’t be into it. If you buy a house with this man you are signing up to a lifetime relationship with the son. This is why blended families don’t work

Eviebeans · 24/01/2026 07:43

maximusss · 23/01/2026 09:55

Because it’s his son. And I’m stressed. I’ve had an email from the solicitors this morning to say that they are aiming for exchange on Monday. I genuinely don’t know what to do.

If you currently own your own home I would say stay where you are

Planesmistakenforstars · 24/01/2026 07:50

Pull out. There will be other houses down the line if you choose to still buy together. If he didn't even raise the issue of another adult living in the house, then he isn't someone to be trusted to buy a house with. Let his son move in with him, and see how it goes for a few months. If they are both able to function like fully grown adults and clean the house, there are boundaries around the gf, the weed etc then have a re-think. I bet he won't move in with just his dad though, because that doesn't come with the maid and housekeeper package.

ruethewhirl · 24/01/2026 07:57

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.

What, and you don't think the boy's untidiness and weed habit have any bearing on the matter? And OP isn't saying he can't 'land' temporarily in a crisis. That's very different from a permanent living setup with someone who doesn't sound like he's learned how to adult yet.

TheLadyWithoutTheLamp · 24/01/2026 07:58

@maximusss what's going on? Are you going to bring us up to date?

RisingSunn · 24/01/2026 08:16

Also - just to add.
He doesn’t even have experience of living with his dad. Why haven’t they lived together before now?

Shouldn’t they establish that foundation - before adding you to the mix!

Imdunfer · 24/01/2026 08:31

HailSofia · 23/01/2026 21:17

If he can pull this shit without talking to you first, what will be next?

If you agree, it has to be at least a 3 bedroom house with one bedroom allocated to his son and one to yours, no compromise on that.

It has to be a 4 bed house (not 3 plus a box room) otherwise he giving her part of a room to his son, and if her daughter ever needs to move in there will be no room for her.

Womaninhouse17 · 24/01/2026 08:34

Imdunfer · 24/01/2026 08:31

It has to be a 4 bed house (not 3 plus a box room) otherwise he giving her part of a room to his son, and if her daughter ever needs to move in there will be no room for her.

More importantly - at the very least , 2 bathrooms.

Imdunfer · 24/01/2026 08:41

Womaninhouse17 · 24/01/2026 08:34

More importantly - at the very least , 2 bathrooms.

I forgot the bathroom. Yes of course, imagine having to share your bathroom with a19 year old whose mother has thrown him out for being messy!

sittingonabeach · 24/01/2026 08:45

DS was already going to be staying one night a week and DD stays sometimes during the holidays so surely bedroom/bathroom allocation would already have been thought about

catmothertes1 · 24/01/2026 08:45

maximusss · 23/01/2026 07:48

I forgot to mention current living situation. We both live separately at the moment but have spent a long time living between the two houses so we know we can live together ok etc.

You are going to go from having your own house to escape to for "me" time to living full time with your partner and now,his adult son?
Sorry,but that would not work for me.

Ebok1990 · 24/01/2026 08:47

Imdunfer · 24/01/2026 08:41

I forgot the bathroom. Yes of course, imagine having to share your bathroom with a19 year old whose mother has thrown him out for being messy!

Plus the girlfriend don't forget.

Imdunfer · 24/01/2026 08:52

sittingonabeach · 24/01/2026 08:45

DS was already going to be staying one night a week and DD stays sometimes during the holidays so surely bedroom/bathroom allocation would already have been thought about

I find men don't tend to think about sharing bathrooms, I doubt it has crossed the father's mind.

sittingonabeach · 24/01/2026 09:03

@Imdunfer but wouldn’t it have crossed OP’s mind as he was already going to be staying 1 day a week at least, or would he have been banned from the bathroom

Imdunfer · 24/01/2026 09:13

sittingonabeach · 24/01/2026 09:03

@Imdunfer but wouldn’t it have crossed OP’s mind as he was already going to be staying 1 day a week at least, or would he have been banned from the bathroom

I doubt he's even thought about it. I very much doubt there's been any discussion with the lad along the lines of "we have an en suite, you'll use the main bathroom, which you MUST keep clean for when we have visitors and for when MK wants to use the bath."

Longtimelurkerfinallyposts · 24/01/2026 09:13

No update from the OP?
I would definitely pull out of this house purchase - and make it clear I was horrified that this precious (adult) DS didn't think he should ask his dad about the possibility of moving in, rather than just telling him. And that his dad's reaction was to say yes, rather than explaining he would need to talk to his partner first, and that neither of them would put up with mess in their brand-new house either.

Thatcannotberight · 24/01/2026 09:20

I hope the new house doesn't have neighbours. If you moved next door to me with a weed smoking teenager, I would be extremely pissed off.

BoxingHare · 24/01/2026 09:22

I think OP started the thread thinking we would say yes she was being unreasonable, and that would put her mind at rest, and the purchase would go ahead as planned.

But we've been unanimous in backing her doubts. Not only that we've introduced questions about the values of her partner.

Maybe that's why she's not been back.

HomeTheatreSystem · 24/01/2026 09:24

Imdunfer · 24/01/2026 08:52

I find men don't tend to think about sharing bathrooms, I doubt it has crossed the father's mind.

Or using someone else's towel 🤮

CarrierbagsAndPJs · 24/01/2026 09:45

His own mother has had enough if his attitude and behaviour. Your partner refused to discuss it with you, and hasnt discussed any of the details. This would stop me in my tracks completely.

I would absolutely be laying very strict ground rules about gf stays over one night a week max. No weed at all. He keeps his room clean. What his share if the housework will be. How much he will contribute towards food and bills. His cooking for the family nights.

Do not let his or his father’s attitude be that mum expects his to be respectful so he is moving in with dad who has no expectations.