Is it wierd for adult syblings to sleep in the same bed?

okay so im 23 and my brother is 31. im staying at his house for a week to help care for my nephew while hes at work. is it wierd for me to sleep in the same bed as him? cause his couch is not comfortable and i have back problems so he said i could just sleep in his room on his bed . its only for like 4 nights. is that wierd? my boyfriend thinks its wored because hes a guy . but with my sister its fine cause shes a girl so im just curious if anyone thinks its wierd. i mean imma sleep wherever im comfortable so it really doesnt matter lol. keep in mind my brother is the closest thing i have to a parent my mom died when i was 13 and my dad died last year in September.

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