Am I the Asshole?

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The original was posted on /r/amitheasshole by /u/Suspicious_League663 on 2024-01-23 03:32:26+00:00.

I ( 28F) moved to the same city as my sister after getting a job there. My apartment isnt ready to be moved in yet so I've been at a hotel for the last week. My sister thinks I'm wasting money and should just stay with her till my apt is ready and a few days ago she offered to let me sleep in my nephews (14M) room.

I asked if I could get new sheets while there. She gets all confused and ask me why because my nephew is super neat. I told her yeah but hes 14 and hes old enough to not wet the bed anymore but now he's "wetting the bed" and alot of times on purpose especially since he got himself a boyfriend. She acts all appalled and says my nephew isnt like that and I'm just like girrrl how detached are you. I reminded her that we have brother.She gets all offended and says to just forget it if i didn't want to stay to just say so. Our parents are mad at me and think I shouldve just accepted her offer and not have made her uncomfortable. AITA?