Ok here’s the full story: DSis has a holiday house in south of France. Currently being renovated so she is renting an apartment for her and DN. Invited me and my DS to come stay there ages ago. Accepted. Then, she invited our mum too but no space in the flat so my mum planned to get a hotel. Then DSis said no, get a three bed air bnb instead so we all have somewhere to cook and hang out (nicer than the flat she is renting). She suggested I should stay there with my DS instead of crammed in with her and DN at the smaller flat per original plan. My mum was the one who told me it was already a done deal and she had booked a three bed air bnb for the three of us (me, DS and my mum) so we could each have our own room. I said great, ok. DS and I spent whole day on trains to get from midlands to south of France yesterday. Arrive hot sweaty and exhausted and it transpires that, because the air BnB is so nice, my DSis now wants to stay here instead and DN (who is rather spoiled) has decided she will sleep in same room as my DS. Even though they already have a separate apartment. DSis even said maybe she would share a room w me but I said er it’s a bit small and don’t you already have an apartment?? And she said ok I’ll hang out here and go back to sleep there. Anyway, DN gets on my son’s tits fairly quickly bc he is exhausted and also she doesn’t like to let him have any space or privacy (she read his diary which kicked off a scene…) Anyway, I (gently) suggested maybe we should stick w the separate apartment sleeping plan at least for tonight as we’re both really tired and maybe we could do a cousin sleep over tomorrow. Sis stormed out and sent me an angry message that her daughter’s feelings are hurt now. AIBU to think she should have managed her own child better and not forced me to have to say no to the sleepover? She was proposing to just leave DN here and go back to sleep at the other apartment alone. Help. I have lots of other stuff going on and can’t work out if I’m the one BU or not here.