A few variations..
Kids open stockings as soon as they are aloud out of their rooms.
All grand parents and Exs arrive before any presents are open.
Presents open and then start making breakfast for every one...
Then Non dinner guests leave kids play with new things and fight over them..and we prepare dinner(turkey, yams,stuffing etc etc) for the guests that are staying or coming for dinner.
There must be a new board game bought for someone for xmas and that is played after the turkey is consumed.
This year it is Carcassonne, THere was a Harry potter trivia game and some japanese robot fighting game..but as head of the house hold I ruled that the game I bought would be the one played...The boys loved it though.
When I was a kid it was always monopoly..I love progress.