One Christmas tradition that lasted in our family for over fifty years, with only a single break: no one gets to open wrapped presents under the tree until after breakfast (and we always had a full family breakfast every weekend at our house), and the dishes are washed, dried and put away.
Mom and Dad used to milk that for all it was worth with extra coffee and getting the whole kitchen cleaned (by us) ‘just so’ before they’d wander out to the living room with us. It’s a tradition that I imported to our kids when they were old enough to be walking.
Oh, and the one exception? My youngest sister who was, I think, around six years old at the time, and who was named for our maternal grandmother… opened a present meant for that Gramma, since they shared the name, after all. It was an expensive bottle of perfume, and she wasted most of it by spraying it around the room before either of the ‘rents was even awake that morning. Never. Again.