Went to PIL for Christmas lunch, they have presents under tree and ds randomly (very randomly) gives them out. There are always mix ups which we have to correct as dh and FIL have the same name which everyone abbreviates in Different ways. Also some said Mum but were for MIL etc.
Anyway dh got nothing from him parents, which is unusual, but in the blur only I noticed. I got nothing either (I got 2 birthday presents 4 days ago and one of them was Christmassy - so it could be I got that one early so I could use it for christmas.)
Anyway, we can't say thank you for a present we haven't got, but if it simply got lost somewhere then it will be rude that we didn't say thank you.