So personally it's 9:30am and always has Been (believe it or not my DD likes it says it makes the excitement last longer)
Personally the entire family stays over on Christmas Eve and Christmas Day (Boxing Day we have a party and then everyone goes home) and so my DD and her cousins (aged 13 and 11) are up from 8:30 latest and sit playing games, talking and watching Christmas tv/movies until we open presents.
As for the routine it's like this
9:30 open presents
10:00ish have a fancy breakfast (fry) in pyjamas with Buck's Fizz
11:00 everyone gets ready
Midday first course of dinner (my sisters homemade vegetable soup it's amazing in my opinion)
3:00 main course of dinner usually everyone has several helpings
5:00 desert
6:00 watch a Christmas film
8:00 bed! Just kidding we start playing games like Mario party, Mario kart and other games like that that can go on very late we usually drop like flies until like 1am
Boxing Day we have a tone of family friends over for a party.
And while we are not loaded we are well off making that party possible. So what are your Christmas traditions like I love reading these it gets the big kid in me all excited