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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:
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!

TheLadyWithoutTheLamp · 24/01/2026 07:58

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

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.

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.

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

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

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.

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.

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!

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

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.

Bogeyes · 24/01/2026 03:51

Pull out now. Red flag here

askmenow · 24/01/2026 02:54

I would pull out!
Your DP making an autonomous decision about a life changing event is a huge red flag.

Let him get away with it this one time and it won't be the last. He's controlling.

DeltaVariant · 24/01/2026 02:50

Sounds like two entitled men who expect their own way 🤷🏻‍♀️.

The way it’s been done would mean I’d pull out.

99bottlesofkombucha · 24/01/2026 02:44

PollyBell · 24/01/2026 02:37

I know it was unexpected but if your children are living with you both you must have known there was a chance he could at sometime, it would be alwayd a chance by having a relationship with someone with children even grown ones

She probably had the absolute audacity to expect it to be a conversation where they agreed parameters though? Eg no weed.

PollyBell · 24/01/2026 02:37

I know it was unexpected but if your children are living with you both you must have known there was a chance he could at sometime, it would be alwayd a chance by having a relationship with someone with children even grown ones

ChocolateBiscuitandaNiceCupofTea · 24/01/2026 02:28

I’d pull out immediately. Keep your own house and security. I’d probably ditch the DP too, especially after this.

Paramaribo2025 · 24/01/2026 01:25

I would pull out.
Stay in your own house.
Ditch the 'D'P.

Oxo01 · 24/01/2026 01:12

Tell him that you dont like being disrespected or taken for granted by having bombshells dropped on you last minute with no discussion what so ever.

That his son who has decided to move in is NOT his sons or his descion to make nor his alone.

Tell him that you have made a decision NOT go through with the move as planned, so he and his son can get a place together for now.
In the mean time you wil be considering your relashionship with him.

You will be walked over by both of them if you go ahead and live with this man / son, once hes in you will not be able to get him out if his dad just makes decisions for you.

Think carefully do not buy together This is a big red flag showing you your future

HermioneGrangersHair · 24/01/2026 01:01

FOJN · 23/01/2026 08:40

But he didn't want to live with his dad when his dad lived alone? I'd be wary about exactly what role you are expected to play in the household.

Doesn’t your DC live with you anyway? - As they are just in the first year of Uni / surely they will have a room in your new house?

ReadingTime · 24/01/2026 00:05

Your DP is being massively disrespectful to think he can just tell you this and you’ll accept it.

This lads own mum can’t stand living with him. This is going to be a disaster if you go ahead with the purchase and it sounds like you’re being set up to be paying for the privilege of being a maid to two men.

FloofyKat · 23/01/2026 23:52

I think a lot of what’s been posted here is irrelevant. What matters is the way Dave has just dropped this on you four days before you are due to exchange, when there has been zero consultation or discussion.

For me, it would definitely be a case of putting the whole thing on hold so you can ask Dave why the f he is playing at and why he thinks it’s remotely acceptable. Ask him why he thinks your views don’t matter and why he thinks so little of you.

Stravaig · 23/01/2026 23:35

Donalbain · 23/01/2026 23:27

I think you’re fine to say no, but if your own child wanted to move back into your shared home in the future due to domestic violence, relationship break-down, divorce, job loss and the myriad other reasons children return home over the course of a life-time, it should be a firm no from the OP’s DP as well. Make sure you have a list of homeless shelters to direct your child to. After all, what’s good for the goose is good for the gander.

Well this is utter bollocks. There is zero equivalence between a very real wastrel 19-year-old who won't clean up after himself and disrespects the home his mother is generously providing for her adult son; and a hypothetical scenario where OP's daughter is in genuine need of temporary sanctuary through no fault of her own.

CJsGoldfish · 23/01/2026 23:30

maximusss · 23/01/2026 10:07

He wasn’t trying to discuss it with me, he told me DS would be moving in and he can have X bedroom. That was it!

Why didn't this trigger a conversation AT THE TIME. Is this a pattern?
He just tells you something and you accept it?

I can sense that you are going to be passive and go ahead on Monday. Pretty sure this won't end well if you are too afraid to address it with him

Donalbain · 23/01/2026 23:27

I think you’re fine to say no, but if your own child wanted to move back into your shared home in the future due to domestic violence, relationship break-down, divorce, job loss and the myriad other reasons children return home over the course of a life-time, it should be a firm no from the OP’s DP as well. Make sure you have a list of homeless shelters to direct your child to. After all, what’s good for the goose is good for the gander.

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