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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:
DancingFerret · 23/01/2026 12:26

Thinking about it, if the OP is going to postpone or cancel the exchange of contracts, given the short notice, it would be prudent to send an email to the solicitor rather than simply making a phone call.

Telephone instructions can be disputed if anything go wrong; a paper trail is essential.

Channellingsophistication · 23/01/2026 12:26

Not discussing it with you is unacceptable. Having his DS with you all the time really changes the dynamics and would you have gone ahead with a house purchase if this was the case?

Silverbirchleaf · 23/01/2026 12:29

ClairDeLaLune · 23/01/2026 12:01

There is absolutely no way in the world I would allow a weed smoker to move into my house. And the lack of discussion would also be a deal breaker for me. Pull out, pull out, pull out!

I agree. Two red flags.

…and to stereotype, weed smokers aren’t often the best housemate either.

3rd red flag - mum moaned at him. Do we know what about? Although I think we san guess.

Silverbirchleaf · 23/01/2026 12:29

Bombinia · 23/01/2026 11:58

I think phone the solicitor is the new cancel the cheque.

@maximusss PHONE THE SOLICITOR AND TELL THEM TO PAUSE THE EXCHANGE

You must do this before you speak to your partner. Just buy yourself some time to think.

Yes!

grumpygrape · 23/01/2026 12:30

KoalaKoKo · 23/01/2026 12:07

How clean is your partner's home? Does he get a cleaner or clean up after himself? I ask because in my experience boys who think they don't need to clean up after themselves usually have learned that from example. In my own family the boys don't clean and my dad is a slob - he has had relationships end because he treats his partners as live in cleaners and I suspect my older brother does the same (though I think he pays for a cleaner these days). Having grown up with men who just leave plates where they land (my 12 year old nephew also now does the same) and never vacuum or put on a load of laundry I would never date a guy who can not clean - they could look like Brad Pitt and have the best personality in the world but I would still run a mile! The weed would also be a big no no! I just know too many boys who smoke weed and sit around the house all day with no motivation to live life!

Personally if it was me I would send them both an email to say "X tells me you might be moving in, that is lovely to hear, it will be great to get to know you more and for you and my child to bond. It is good to start on the right setting so that we all have a great living environment. One thing I do have to bring up is that X has mentioned that you sometimes smoke, it is a strictly non smoking house, that includes the back garden. In terms of house rules, they are quite simple and what you are probably used to in your mums. We will have a cleaning schedule for all of basic chores we do weekly (bathrooms, hoovering, dusting, kitchen etc) with the expectation that everyone will do their own dishes and clear up after themselves every day. In terms of bills the easiest thing to do as we are all working adults is to split them three ways and if my child moves back in we will split them in four. We can also set up a kitty that all adults contribute to equally for cleaning products and things that we all use like milk, tea and coffee! As we are obviously looking forward to enjoying our new house as a family we do ask that you don't have overnight guests more than one night a week without prior consultation."

I would put everything in writing in a friendly way that makes it clear that the girlfriend will not be moving in by stealth, no smoking anywhere and everyone should clean the house! I would also suggest to his partner that he charges a small amount of rent (perhaps £300) that he puts into a savings account each month for his son so that he is not spending his salary on weed and is building up a deposit to eventually get his own place. Key is whatever you put in place for his son you will also have to follow for your own child!

I’m not sure I’d want my independent, Uni, daughter to bond with my partner’s slobby weed smoking son…..

You have some good points regarding the state of the partner's house though.

Nanny0gg · 23/01/2026 12:31

Matrons · 23/01/2026 11:33

Sounds like it was a surprise to your partner as well so it is not his fault....

Parents often live with adult children as it is do expensive for them to move out, it's nice that his son wants to live with him.

I would always put my child first so if you refuse it could cause problems in your relationship.

There already ARE problems!

He's presented the OP with a fait accompli.

No discussion, no plans.

It would be the end for me anyway

Bleachedjeans · 23/01/2026 12:31

Your house will smell of weed and be a mess, too.

Itsseweasy · 23/01/2026 12:32

Myfridgeiscool · 23/01/2026 07:55

That is not a trivial thing. Moving someone else into your home without discussion is unreasonable.
I'd not go ahead with the purchase. Stay in your own home.

This.
Your “DP” has been very underhand with this. Is he always so manipulative?
Huge red flag there, never mind the messy, pot-smoking teen who the Mum’s had enough of!
Honestly if you don’t pull out I suspect you’re walking into a very unpleasant situation.

grumpygrape · 23/01/2026 12:33

pinkyredrose · 23/01/2026 12:19

Like fuck would I complete on Monday. Your partner had shown you clearly that he doesn't respect you. What happens when a mate of his needs somewhere to stay and you come home to someone else in the house?

If you go through with this you'll be living with 2 extra adults and thier mess and weed smoke, eating your food, pushing your bills up.

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.

Isn't it convenient that he's fed up of his mother at the exact same time you're buying a house.

Oh, heavens, not a three way mortgage where the OP has the minor share.

Stravaig · 23/01/2026 12:33

CelticSilver · 23/01/2026 12:17

OP, your opening line is 'I suspect I'm being unreasonable'. You've just had nearly 500 responses saying you are most certainly not being unreasonable.

Have a think about what that means.

Yes, it's an abusive relationship, isn't it, and OP's already normalised other coercive behaviour.

OldGothsFadeToGrey · 23/01/2026 12:34

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!

This would have me pulling out. If he pushed it I’d reconsider the relationship.

His son’s mum moans at him because he’s messy, so he’s decided to move in with you. You won’t be able to moan at him but you can guarantee he will still be messy!

You thought you were moving in with your romantic partner but now it looks like you will pretty much be living with another couple.

It’s been announced as a done deal. Hard to say no now without being the bad guy and the house falling through. ENORMOUS red flag.

His son will be smoking weed in the garden of your new house, all your neighbours will probably slag you off (I know for a fact all of my neighbours would hate you for that. They won’t care who was smoking - they will group you together!).

No thanks.

Itsseweasy · 23/01/2026 12:34

I can’t get over the fact that you didn’t go nuclear when he TOLD you it would be happening!
He is completely unreasonable - please don’t be so passive. This is setting yourself up for a lifetime of giving in to his unreasonable demands.

Puzzledandpissedoff · 23/01/2026 12:36

I don’t think this thread is genuine
No one would allow themselves to be treated like this

I confess I'd wondered myself, though even those often raise discussion points which can be useful to others, but can't agree that no one would let anyone treat them this way

Unfortunately there seem all too many who'll do exactly that Sad

MO0N · 23/01/2026 12:36

What a piece of work this man is, he's deliberately waited until she has committed herself and can't pull out of the deal.
And this is his opening move in your shared life together.
I would be telling him that I am no longer on board with this shared purchase.

Cocomelon67 · 23/01/2026 12:36

This is tricky. I think for many of us, our kids will have a home with us as long as we have capacity to offer it. It’s a given. So in that sense I can see your DPs perspective. But to casually mention it is very off. S/he should have discussed it with you. Ideally a long time ago, before this eventuality ever even occurred (what would your feeling be about my DC needing/wanting to move in, this is my feeling on it…). The lack of communication is something that would upset me too.

Daleksatemyshed · 23/01/2026 12:36

Some people here are forgetting there's a big difference between want and need. The son doesn't need rehousing because he can't afford his rent or because he needs to be closer to work, he wants to move in so he can have it all his own way, smoke weed, live like a slob and pay nothing for his keep. If his DF lets him move in he's teaching him a very poor lesson for life, don't pay your way, don't try and be reasonable, don't respect others, just do as you like

Getupat8amnow · 23/01/2026 12:38

Do not exchange on the new house. You will regret it and be stuck living with a 19 year old you not related to who smokes weed ( he will smoke it indoors if it is cold or wet outside no matter what you say) and has a girlfriend who will be in your house every day. He is also messy.

These are the reasons his mum moans at him.

Stay in your own home.

Zippedydodah · 23/01/2026 12:39

Daleksatemyshed · 23/01/2026 12:36

Some people here are forgetting there's a big difference between want and need. The son doesn't need rehousing because he can't afford his rent or because he needs to be closer to work, he wants to move in so he can have it all his own way, smoke weed, live like a slob and pay nothing for his keep. If his DF lets him move in he's teaching him a very poor lesson for life, don't pay your way, don't try and be reasonable, don't respect others, just do as you like

And there’s the girlfriend too.
Personally I’d be flatly refusing to proceed, red flags galore OP.

pinkyredrose · 23/01/2026 12:40

grumpygrape · 23/01/2026 12:33

Oh, heavens, not a three way mortgage where the OP has the minor share.

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.

HazelMember · 23/01/2026 12:41

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!

This is a huge red flag.

Is that how your relationship generally works? He does not discuss with you and says what goes and you stay quiet?

MO0N · 23/01/2026 12:41

Itsseweasy · 23/01/2026 12:34

I can’t get over the fact that you didn’t go nuclear when he TOLD you it would be happening!
He is completely unreasonable - please don’t be so passive. This is setting yourself up for a lifetime of giving in to his unreasonable demands.

I'd say that part of the reason for her lack of reaction is that he has blindsided her.
It's an ambush, a surprise attack, it leaves you reeling because you can't process it.
The person that you have trusted and have committed yourself to has behaved in a way which is completely at odds with what you believe about them.
You are somewhat in shock, your unconscious takes over, you freeze.

pinkyredrose · 23/01/2026 12:41

Op the son doesn't need to move in, he already has somewhere to live.

Ask yourself why he'd rather move house than start tidying up his mess?

Itsseweasy · 23/01/2026 12:43

MO0N · 23/01/2026 12:41

I'd say that part of the reason for her lack of reaction is that he has blindsided her.
It's an ambush, a surprise attack, it leaves you reeling because you can't process it.
The person that you have trusted and have committed yourself to has behaved in a way which is completely at odds with what you believe about them.
You are somewhat in shock, your unconscious takes over, you freeze.

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.

ThejoyofNC · 23/01/2026 12:44

Not a chance, I'd have a lazy weed smoking slob moving in with me, especially not without a discussion about it.

If his own mother can't put up with him, why should you?

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.