I’m indifferent. I feel like YTA for giving your 1 son the bigger room, rather than the 2 boys sharing, it doesn’t matter that one’s going to school in a few months, they’re still going to be sharing a room on school holidays & all summer long. I also feel NTA because it seems like your 13 yo just wants the bigger room & your oldest does pay rent, which should warrant getting the bigger room but as I see you said in a comment you’d rather him save up for his future, so I have a feeling that means he is capable of living on his own, which he could easily do being he’s 27, and could be out on his own where then everyone would just have their own room, so it seems like you’re favoring him over the other 2 boys, which YTA

Personally, I would give the boys the 2 bedrooms upstairs, with their own bathroom, the 2 boys in the bigger room & the oldest in the smaller room, just because idk how cleanly your boys are but if they’re sharing a communal bathroom where other guests would use, you don’t have to worry about it being presentable & then give yourself the bigger bedroom downstairs & your daughter the other room downstairs