All of them are correct. )
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AnonymousIf there are more choices,You can just say "I was at my friend's" if you want a shorter version.
AnonymousSo it's perfectly ok to write/say:I was at my aunt's and uncle's.I was at my grandma's.I stayed at my mum's.I was at my girlfriend's yesterday.I stayed at my parents'.Yes. All are fine.