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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:
velvetgeranium · 23/01/2026 12:46

Itsseweasy · 23/01/2026 12:43

Ok and now she’s had a moment to process it, she’s started this thread saying she knows she’s likely being unreasonable 🤷🏼‍♀️
Doesn’t seem like she feels able to stand up to his manipulation.

Yup. She's going to buy that house with that shit man. Meanwhile, those of us who have been there and got the shitty tshirt to show for it recognise how her life with him )and his weed-smoking son and his girlfriend on top) will turn out.

What kind of person springs this sort of thing at the eleventh hour before a joint property purchase as if it is a done deal? Not one I would want to tie myself to. But you have to live and learn, I guess.

HazelMember · 23/01/2026 12:47

MO0N · 23/01/2026 12:45

This man didn't want his son living with him previously. He wants him there when his partner is living with him because he knows that he will be able to make sure that she is the one who bears the brunt of his son's bad behavior.
He wants to be able to score points with his son, get the credit for making his life easier. Score points over his ex because he will now be the favoured parent who lets his son do as he wants.
And all of the cost for this will fall to @maximusss who has been duped, she will be the unpaid maid who cleans up after them.

Edited

Crappy fathers always try and rope in another woman to do the work they don't want to.

grumpygrape · 23/01/2026 12:47

pinkyredrose · 23/01/2026 12:40

Of course not but I'm saying he should be responsible for costs. Unless he thinks he can move in, carry on making a mess and pay fuck all.

Edited

You said ‘Tell the son that of he wants to move in to your house he's responsible for a third of the mortgage payments and bills.’

You need to be careful if linking rent/keep etc. to mortgage costs. Someone ‘paying a third of the mortgage payments and bills’ might contend they have an interest in the house. Rent or keep, by all means but don’t link it to the mortgage costs.

Sailawaywithmex · 23/01/2026 12:49

I feel like he's conned you into being able to afford a property for himself and his son. You definitely should have been considered and had a conversation about it. I applaud you for saying it's his son, as many are cold towards step children however, this is also your home that you are contributing towards. Definitely put your foot down NOW, before you are trapped and it becomes a lot harder.

KatsPJs · 23/01/2026 12:50

I’m sorry but I’d pull out OP. Your DP clearly waited until the last possible moment to tell you to try and ensure you can’t do anything about it. It’s manipulative and duplicitous. I’d pull out and stay in my own home in comfort rather than risk this living arrangement.

You have actually never lived with your DP (staying over, even for extended periods of time is not the same) and he’s expecting you to go from living apart to living with him and his adult son who has challenging behaviours to such an extent his own mother has had enough of him? Absolutely not.

TomatoSandwiches · 23/01/2026 12:50

maximusss · 23/01/2026 10:18

He’s working and can’t really answer the phone. I’ve text him and asked him to call me on his lunch break. I just feel sick about the whole thing

Phone the solicitors first to put a pause on any paperwork going through for the exchange. It will make you sound serious op, don't let him manipulate you.

LightDrizzle · 23/01/2026 12:51

maximusss · 23/01/2026 10:18

He’s working and can’t really answer the phone. I’ve text him and asked him to call me on his lunch break. I just feel sick about the whole thing

You have my sympathy. I’d find it really hard and really stressful but it sounds like, like me, you have been through a divorce or breakup and so you know how important it is not to sleepwalk or end up in these situations out of conflict avoidance. I’m terrible at putting this into practice myself and I think he won’t react well but there is just too much at stake.

MO0N · 23/01/2026 12:52

The problem that the op has now is that her lack of reaction when he sprung this on her makes it even harder for her to react against it now.
Please gird your loins @maximusss and stand up to him, tell him that you have thought it over and you cannot proceed because he has moved the goal posts.

Needapadlockonmyfridge · 23/01/2026 12:52

Tessasanderson · 23/01/2026 10:29

Just read about the smoking weed. In your position he wouldnt even get over my doorstep, never mind live there. I wouldnt have a weed smoking teenager anywhere near my house.

You are setting yourself up for misery with the son and the father

This. I would be pulling out, sorry.

bigboykitty · 23/01/2026 12:56

MO0N · 23/01/2026 12:52

The problem that the op has now is that her lack of reaction when he sprung this on her makes it even harder for her to react against it now.
Please gird your loins @maximusss and stand up to him, tell him that you have thought it over and you cannot proceed because he has moved the goal posts.

That's not really the OP's problem. She can simply say that she was so absolutely shocked by his appalling behaviour that she was lost for words. That obviously she has paused the exchange and that a serious conversation needs to happen to see if there is any way of retrieving the situation. That should put the shoe back on the other foot.

PhuckTrump · 23/01/2026 12:57

Nope. Keep your own separate houses until DC have properly launched. I wouldn’t want a pot-smoking, mess-making flatmate who pays no rent/bills and has his girlfriend round all the time either, OP!

BruceAndNosh · 23/01/2026 12:58

2 major issues
Lack of any discussion re his son moving in, and no discussion about financial contribution from son
His mum moans at him a lot. So he is a bad housemate

When he is messy at YOUR house, who is going to moan at him? His dad or you?

jenny38 · 23/01/2026 12:58

Well it's a spanner in the works. I would set a reasonable amount of board for starters. However thinking long term, your child finishes uni, says mum I'm coming back to live with you. Would you say- hang on, I will just ask dp? I doubt it. Feel for you, as this wasn't part of the bargain

WhatNext2026 · 23/01/2026 12:59

Don't exchange.
You have the right to live in a drug-free home.
At the very very very least, you need to tell your partner why the lack of prior discussion is an issue for you.
Also will his DC already being in residence put your DCs off and mean they have no safe space if they need it after uni? It all needs careful discussion and planning.
You're entitled to have house rules which his son needs to abide by as a condition of moving in. If he's not prepared to abode by them then it'll be your life made difficult.
In your position I'd keep my own house until all kids are away and settled.
Remember this is your life and you have to stick up for yourself. There's no reason to feel bad about doing this in response to this new situation that's been flung on you.

MO0N · 23/01/2026 12:59

This man has been playing nice and keeping you sweet, waiting until you're committed and he has more leverage.
Now you are seeing who he really is, he expects to be able to call the shots and you have to meekly obey him.

Thatcannotberight · 23/01/2026 13:00

No to messy, no to girlfriend and definitely no to weed. It stinks and your house will have it wafting around, especially if he keeps weed in his room. Mum is right to have had enough. I would never take this on.

SauronsArsehole · 23/01/2026 13:02

Just want to add OP, I know it’s a faff and money will be lost, you’ll piss off the onward chain

but you can say no. You can refuse to buy a house. You can say that DS moving in changes things because you believed you were in a different life stage (kids moving out and on with life not back in!) and that you believed going forward it would be your pair as a couple with kids visiting not moving in (with limited prospects)

you can tell him the lack of discussion about your SHARED home is a massive cause for concern because DP doesn’t just have himself to think about and it’s YOUR home too.

would DSS and his weed smoking potentially impact your career?

im currently applying for a job where random drugs tests are mandatory so for me anyone doing any drugs in my home would be too big a risk for me to take with regards to my potential employment.

remember you can pull out, say no.

TFImBackIn · 23/01/2026 13:03

I would feel absolutely terrible for the house sellers, but I would pull out of the sale unless your partner agreed his son wouldn't move in.

It's hardly a recommendation that his mum wants him to leave because he's messy. It's also hard to think of his son living there with his girlfriend, rent-free, accompanied by the smell of weed.

You need to make an instant decision, OP. I couldn't forgive my partner for this. If the sale ended because of this I'd dump him immediately.

Are you selling your own place or are you renting?

CantThinkofaNam · 23/01/2026 13:04

MO0N · 23/01/2026 12:59

This man has been playing nice and keeping you sweet, waiting until you're committed and he has more leverage.
Now you are seeing who he really is, he expects to be able to call the shots and you have to meekly obey him.

This is it. If your kids have left home and you have a lovely home all to yourself, I think it’s madness that you would invite these problems into your life.

oscalo · 23/01/2026 13:04

If you go ahead and it's looking likely, those two men will rule your life as long as you are in that house. It's obvious they will gang together against you if necessary.

The underhand thoughtless way your DP just decided this was happening is unreal. You are not his partner, just half the mortgage payment.

Slippery slope here. Think hard.

RaininSummer · 23/01/2026 13:04

If you do decide to go ahead, make clear that the son has house rules and pays some keep. If he was messy at mum's he will be messy at dad's too so get an agreement before he moved in.

TinyCottageGirl · 23/01/2026 13:05

FOJN · 23/01/2026 07:58

Having an issue with his son moving in and having an issue with him not discussing it with you are two different things.

Had you discussed how expenses would be divided? Did you think it would be 50/50 and are now being expected to pick up half the tab for another adult you weren't expecting to be sharing a house with?

I think your partner is really unreasonable to think he can move his son in without discussing it with you and I would be very concerned that he will continue to make decisions affecting you without any discussion. I would not move in with someone who had so little regard for me.

I also wonder about how your partner treats you generally for you to be questioning your feelings about this. It's him, not you. If he often makes you feel like you're the problem you should not move in with this man.

Edited

Yes especially as you will now be living with two adult men, sorry but this would be a huge issue if not discussed and agreed prior. Speak to your partner now

CantThinkofaNam · 23/01/2026 13:06

If his own mother has had enough of him, then don’t say you didn’t see the big red flag waving in your face. Don’t say you had no choice and were fooled into this. You know NOW, before the exchange happens. So how this pans out is entirely in your control here.

Oriunda · 23/01/2026 13:07

How many bedrooms does this new house have, OP? I’m assuming 3, right? One for you and DP, one for the son and one for your daughter? Because if I were your daughter, I’m not be impressed if there was no room for me at the inn because the son and his GF had the room. You risk her not wanting to stay or visit, or at the very least feeling unwanted.

pinkyredrose · 23/01/2026 13:08

grumpygrape · 23/01/2026 12:47

You said ‘Tell the son that of he wants to move in to your house he's responsible for a third of the mortgage payments and bills.’

You need to be careful if linking rent/keep etc. to mortgage costs. Someone ‘paying a third of the mortgage payments and bills’ might contend they have an interest in the house. Rent or keep, by all means but don’t link it to the mortgage costs.

I meant a third of what the mortgage costs, not adding him to the mortgage or anything.