My family opens presents on Christmas morning.
We used to have a family tradition though where everyone on my mom's side of the family would bring the presents to each other over to my grandma's house and put them under the tree there (they always have a huge real tree) and then we'd all open them up on Christmas eve at midnight, but we don't do that anymore... one year we didn't do it for some reason and we just stopped doing it. It's too bad, actually. We still do the whole thing where we bring the presents over to my grandmas and everyone opens them there, but we open 'em on Christmas day now instead of Christmas eve.