AIBU to let my adult nephew move in after rent rise from my sister?

Tbh, youre in between a rock and a hard place.

If you do this you may ruin your relationship with your sister but I can see why youd want to help

Id be inclined to ask DSis why shes increasing it, and talk to her about why you might let him stay before making a decision

You’re all adults and your nephew is lucky to have you. Your sister sounds really mean!

I suspect it has to do with her partner.

Looking at it objectively, as someone with no skin in the game, I say it's a simple matter of a man needs somewhere to live and you have the space/resources/will to have him take a room in your house. Why wouldn't you?

She wants him out. He's moving out. So what's her problem?

I wonder if she thinks that him moving in with you makes her look bad.

He’ll just be doing a house share with his aunt! :) for a much better rate and enabling him to move out quicker long term

Um - your sister is trying to make money out of her son. Of course offer him a place to rent if you like him

You are a lovely aunt.

His mum is not nice.

I think (assuming he’s just got a room in the house and not a separate granny annex type thing) that £800 is really excessive to charge your DC when they are responsible and trying to save.
I think it’s perfectly fine for you to have him come live with you.

Speaking as a mum of a 24 year old, who works full time (mostly from home), does his own washing, and is away most weekends, I would hate it if we got to the situation where he didn't feel welcome at home, but if we did I would be grateful if someone I knew took him in so I would know he was in a safe situation.

I would charge your nephew rent, but if you don't need all of it, save it for him and give it back when he moves out.

In this day and age my son can stay here as long as he wants. He's a good lad and very useful as a taxi driver as he doesn't drink 🤣

She's being unreasonable. £800 is far too much anyway, but if he can find somewhere cheaper (even if it's with you), why would she object? Is she trying to teach him some kind of lesson? Or is she annoyed that she won't make so much money out of him?!

In which case, why would the sister object to him living with OP?

I'd say yes but maybe agree a time limit. Live with us for a year or whatever...

I'd be tempted to ask dsis how much profit she reckons you are making on £400?
Add another £400 and that tells you her profit.
Nothing wrong with expecting an adult child to pay their own way, even if you wouldn't do it. Profiting though seems underhand.

Does your sister have high housing costs?
Not always appropriate to compare,, people's circumstances are hughly variable.
800 pcm is 200 pw which is very cheap for housing /food /bills.
Relevant if sister has minimum income.

800 a month is insane! Why do they not want you to take him in? Because they’ll lose an income? Ffs! OP I would 100% let him live with me, take the £400 and fuck her and her partner .. I’m sorry I find them wanting £800 just utterly vile!

Well she managed it before he was earning … £800 a month is a lot!

You are all adults, if he has asked can he live at yours,you are happy to have him,then that's between you and your nephew. Your sister says she won't budge,that's her decision.
Your sister is saying that you are trying to make money off him.... Eh, think she's a bit confused.

Your sister is bonkers and greedy, £800 is wayyy too much. Trying to profit from her son, wtf. I think you shouldn’t get involved, though. He can definitely find a room to rent for less than £800.

I would 💯 allow him to move in. Take 400 pm and save 100 pm for him.

This

Agree, do it for £400 a month and then if you feel like it save some of it for a gift when he has enough for his own place which would be a lovely surprise for him.

Your sister is only pissed off because she wants to make money out of him. £800 a month for an adult child is nuts - especially as she's practically doubled it.

Your offer is fair and generous and of course it would be better that he lives with you and his cousins while saving for a deposit. I'd take the hit and piss my sister off. She can get a lodger if she needs the money that much.

That is going to make his own mother look like a right bitch in comparison, though!

I agree with you and £800 is too much unless he owes her money but you will be paying for his food and more in bills and does he have a car and he has a girlfriend so she will be round also putting up yours bills and eating your food

Sounds like another poor mother putting a partner ahead of her son.
Happy to subsidise a partner but will screw over her son.
God but that is ugly.
If it is the truth, please take him in and don't defend her.
Hopefully he will move on in his life from her awful mothering and judge her very harshly in the future.

In fact you might tell her that.
Her treatment of her son is not something he will forget and she will be judged very harshly.

Her son won't forget this and rightfully so.