Dress up for Christmas dinner or pjs/casual clothes?
We tend to still be dressed up in nice clothes from visiting earlier in the day. Sometimes, I may have changed into less formal but still nice things.
Traditional Christmas dinner or something unconventional?
Traditional turkey - although we are thinking of goose to accompany the spiced beef (essential) this year instead.
Presents for all or just kids?
Oh, presents for all of course!! Although, my siblings and I changed (about 5 years ago now when all well into their 20's) to having a KK draw so everyone buys 1 big present and gets 1 big present; and you get something either ?5 or less, or make yourself, something for everyone else AND all the significant others (SOs are not yet in the KK draw, but may be next year - change comes slowly!!).
Christmas lists or surprises?
Surprises. Sometimes there may be hints for things someone would like, but not a full on list, and the end result may be very different anyway. But it can be difficult sometimes coming up with something some people may want/need/love rather than another year of bath smellies (although Mum still loves a Chanel No.5 bath bubbles set).
Religious services or stay at home?
Mass on Christmas morning - timing depends on location and whether my Uncle is saying it somewhere, but it's one of 2 times a year we are guaranteed to go to Mass.
Orgy of present unwrapping or controlled distribution through the day?
If staying with family, 2 orgies (1 on emergence from bedroom first thing at PILs, 2nd late afternoon in my parents). In our house, 1 controlled orgy in late afternoon when visiting done, turkey in oven and a bottle of something can be opened!!
Family decorated tree or poncetastic colour coordination?
Family version but tastefully done!!
Hand back presents if unwanted or smile and say thanks?
"A Guide smiles and sings under all difficulties" - and I'm afraid of a clip around the ear from my mother!! 
Do you host or do family congregate with contributions?
If we stay in our house, it's just us 3. If we travel, both our mother's host (PIL eat at midday, my parents late evening), so we bring something with us to both. We can't really host them as we are 160 miles away.
Stockings for all or just for the young ones?
DD gets her stocking as a proper stocking. Any of my siblings sleeping under my parents roof on 24th get the traditional "fruit, sweets, undies and a book". And then my siblings also now have the ?5/less pressies which do actually come in a stocking (as I was daft enough to sew those a couple of years ago). I am trying to persuade DH to do one for each other this year