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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:
Oopsylazy · 26/01/2026 23:42

maximusss · 26/01/2026 21:28

I’m sorry for the radio silence, I’ve had a lot to think about and had a rubbish weekend.

I’ve asked that the solicitors hold off for exchange for the moment. My buyers have had an unexpected issue with their mortgage offer which is actually giving me a bit more time to work out what’s best to do.

I appreciate everyone that has been lovely x

I’m so glad you have more time to think.

What did your dp say about your reaction to it all?

Just remember that you can still put a stop to the house purchase, and if your dp is a good partner he’ll understand that you want to postpone things until your dc’s are more settled.

You have to ask yourself, if his ds was to move in with you, how long is it likely to be for? Because I’m guessing it won’t just be a few months.

Wonkywalker · 26/01/2026 23:36

Thanks for the update and so pleased that you have delayed the exchange.

Did you discuss a cohabitation agreement before his bombshell news of his son moving to live with you?

A cohabitation agreement can set out ground rules for how you will manage finances and household rules for the jointly owned property.

To be honest, his actions give the impression that even with an agreement he will ride roughshod over you and your wishes.

I would only buy with him after I had rented with him for 6-12 months as if you buy you could end up stuck waiting for the house to sell if you can't cope with your DP, his son or the son's girlfriend. If they refuse to sell up if could take 12 months plus and £££ to get an order for sale of the property and then another 12 months plus to get the house sold and to get the house sale to go through.

That could mean over 2 years of hell as I suspect your DP won't have your back when you have issues with his son and unlike the boy's mother you won't easily be able to sort out the problem.

Please think really carefully and think about a cohabitation agreement if you decide to go ahead despite the red flag.

CarrierbagsAndPJs · 26/01/2026 23:11

maximusss · 26/01/2026 21:28

I’m sorry for the radio silence, I’ve had a lot to think about and had a rubbish weekend.

I’ve asked that the solicitors hold off for exchange for the moment. My buyers have had an unexpected issue with their mortgage offer which is actually giving me a bit more time to work out what’s best to do.

I appreciate everyone that has been lovely x

Did he actually discuss anything with you?

grumpygrape · 26/01/2026 23:09

maximusss · 26/01/2026 21:28

I’m sorry for the radio silence, I’ve had a lot to think about and had a rubbish weekend.

I’ve asked that the solicitors hold off for exchange for the moment. My buyers have had an unexpected issue with their mortgage offer which is actually giving me a bit more time to work out what’s best to do.

I appreciate everyone that has been lovely x

OP, pleased you have been able to put things on hold to get some thinking time. You’ve got a lot to think about and maybe discuss with your partner.

I'm not going to tell you what to do, I'm not you, but do make good use of the time. 🤗

Unexpectedlysinglemum · 26/01/2026 23:09

You absolutely should postpone the exchange before you do counselling or mediation. Not due to the son issue per se but because he blindsided you and this is not someone you want to be totally tied up with financially

sittingonabeach · 26/01/2026 23:07

But staying once a week would still involve a bedroom, still involve all the things the OP was worried about eg mess, girlfriend staying, weed smoking. Again why does mum always have to take the hit of adult DC living with them. More dads should step up.

Her DD occasionally stays at the house, but could potentially stay full time after uni.

EstoyRobandoSuCasa · 26/01/2026 23:06

OP, how would you feel about pulling out of this house purchase and seeing what happens after your DP's son moves into his current home?

If your DP sets house rules and his son abides by them, and is also polite and considerate towards you when you visit or stay over, then maybe after several months of this arrangement, you could look for another house to buy together.

On the other hand, if your DP and his son end up living in a tip which smells of weed, and clearly hope that you will cook and clean for them when you stay over, then don't buy a house together.

Catpuss66 · 26/01/2026 22:51

Greenmouldycheese · 26/01/2026 22:18

Well yes of course its a statement. My kids living with me wouldnt be up for discussion either. They would simply be welcome without question, especially at 19.

Edited

He wasn’t living with his dad before usually stays with dad once a week, his mom chucked him out. This plan involved no agreement with the OP who is buying half the house. This is the problem he kept this from her couple days before exchange of contracts. Glad she has decided to delay, but a great big flag, imagine what other things he is going to keep from her debt? She has protect herself financially.

WearyAuldWumman · 26/01/2026 22:48

Greenmouldycheese · 26/01/2026 22:18

Well yes of course its a statement. My kids living with me wouldnt be up for discussion either. They would simply be welcome without question, especially at 19.

Edited

Of course they'd be welcome in your house. However, you cannot speak for the person with whom you share ownership. If you want that to be an option, you need to discuss it first.

Studyunder · 26/01/2026 22:19

Glad you gave some time.
Red flags galore if his own mother doesn’t want him living with her and/or he doesn’t respect her rules or house! I see zero reason he would respect you either. Your partner had just said this will without discussion, so the same will happen with all future events regarding his son. You may find they have each others backs and it’s you vs them.

I’m sorry this has happened but it could be your get out of jail free card! I hope things turn out well for you 🤞

sittingonabeach · 26/01/2026 22:18

Have you discussed this with your partner @maximusss

Greenmouldycheese · 26/01/2026 22:18

m00rfarm · 26/01/2026 22:16

You’ve missed the point. It was not discussed. It was a statement. My son is moving in. He’s having this bedroom. Can you see the difference

Well yes of course its a statement. My kids living with me wouldnt be up for discussion either. They would simply be welcome without question, especially at 19.

m00rfarm · 26/01/2026 22:16

Greenmouldycheese · 26/01/2026 21:37

All the op and the father need to do it say there are house rules. Its really not difficult. If anyone tried telling me my children couldnt live with me, especially at 19 where they are often in rubbish jobs, I would get rid of them immediatelyas my children come first. Its not like the son is in his 30s and being a bum. Hes only 19. I bet op wouldnt bat an eye if her children wanted to come home after uni to save for a few years.

Do you all throw your kids out at 18 and thunk you've done your bit?

Edited

You’ve missed the point. It was not discussed. It was a statement. My son is moving in. He’s having this bedroom. Can you see the difference

gardenflowergirl · 26/01/2026 22:10

I'm glad you had more time to think, but if in doubt, don't do it. The fact that your partner just said his son would be moving in without a discussion is a big red flag. Theres obviously been no discussion about the reasons his mum doesn't want him there or boundaries and rules in your house. Your partner is ignoring all that and giving you a fait accomplis. Does that modus operandi bode well for your future relationship? I think not!

Greenmouldycheese · 26/01/2026 21:40

.

Egglio · 26/01/2026 21:37

I'm glad you have time to think OP. I hope you can make the best decision for you all.

Greenmouldycheese · 26/01/2026 21:37

ruethewhirl · 26/01/2026 09:39

Yes, oh so wicked not to want weed smoking, mess, disrespect and general lack of consideration in her own home with no say in whether this takes place or not. 🙄

It sounds like your DC are still living at home. If that's the case, would you/do you tolerate them behaving like this? If so, you're not exactly setting them up for a future as functional adults, however you might like to judge others for expecting that by 19 a person should have learned some basic adulting and consideration for others.

All the op and the father need to do it say there are house rules. Its really not difficult. If anyone tried telling me my children couldnt live with me, especially at 19 where they are often in rubbish jobs, I would get rid of them immediatelyas my children come first. Its not like the son is in his 30s and being a bum. Hes only 19. I bet op wouldnt bat an eye if her children wanted to come home after uni to save for a few years.

Do you all throw your kids out at 18 and thunk you've done your bit?

GeorgeMichaelsCat · 26/01/2026 21:33

maximusss · 26/01/2026 21:28

I’m sorry for the radio silence, I’ve had a lot to think about and had a rubbish weekend.

I’ve asked that the solicitors hold off for exchange for the moment. My buyers have had an unexpected issue with their mortgage offer which is actually giving me a bit more time to work out what’s best to do.

I appreciate everyone that has been lovely x

What a great update. I am so pleased.

WearyAuldWumman · 26/01/2026 21:31

I'm very glad that you have breathing space.

Thank you for updating.

maximusss · 26/01/2026 21:28

I’m sorry for the radio silence, I’ve had a lot to think about and had a rubbish weekend.

I’ve asked that the solicitors hold off for exchange for the moment. My buyers have had an unexpected issue with their mortgage offer which is actually giving me a bit more time to work out what’s best to do.

I appreciate everyone that has been lovely x

OP posts:
Silverbirchleaf · 26/01/2026 21:24

@maximusss Hope all went well today, whatever decesion you took.

Whatsappweirdo · 26/01/2026 21:23

Hope you’re ok @maximusss

bigboykitty · 26/01/2026 16:30

BoxingHare · 26/01/2026 09:25

The least people who come on here asking advice can do is take a few seconds to say thanks. They don't need to entertain us or bring us up to date. When you ask for assistance, get that assistance, then never acknowledge it, it's just rude.

She can do what she wants of course, it's her perogative. We can comment on that without needing updates or a blow by blow account of what's happening in her life. Or getting a scolding by seemingly morally superior fellow posters.

😂

BastardtheCat · 26/01/2026 14:29

BoxingHare · 26/01/2026 09:25

The least people who come on here asking advice can do is take a few seconds to say thanks. They don't need to entertain us or bring us up to date. When you ask for assistance, get that assistance, then never acknowledge it, it's just rude.

She can do what she wants of course, it's her perogative. We can comment on that without needing updates or a blow by blow account of what's happening in her life. Or getting a scolding by seemingly morally superior fellow posters.

It’s good that you recognise that some posters are morally superior.

sittingonabeach · 26/01/2026 09:55

I would expect house rules to apply for 19yo but they would apply to my own DC as well (and indeed partner!).

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