Ok, my DH and I just had a heated discussion about this a couple weeks ago. Growing up we were allowed to open ONE small gift Christmas Eve. The next morning, Christmas Day, we opened ALL the rest of the gifts, some were from Santa, some were from Mom, Dad, sister, etc.
On Dh's side of the family, when he was growing up he opened all his presents from his relatives, including his mom and dad on Christmas Eve.

: WTH? Then he only opened his "Santa" gifts on Christmas Day. Well.......now we all truck over to his mom's house and open ALL our gifts at her house on Christmas Eve night. I HATE THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!! I think Christmas should be about CHRISTMAS DAY! So, I have refused to open any of my gifts there. I tell them I believe presents are for Christmas Day. They all laugh, but now with kids everyone expects them to open all their presents Christmas Eve night and ONLY the Santa gifts Christmas Day. I told Dh his mom can do what she wants, but at OUR house we are opening all our gifts on CHRISTMAS DAY. It is so frustrating. I just don't get it.

Sorry to sound bitchy, but this is a sensitive subject to me at the moment.