I've remarried so we take it in turns as to where the kids are for Christmas each year. This year they're at their dads so we've got DD2 (now 3 months) all to ourselves until the evening. It works out that they'll be at home next year which is when DD2 will notice more of what is going on...
When they're at their dads, we end up having 2 christmasses really - Christmas morning for us either at home or at my parents, then the kids come home and get their presents from my parents. Then, we do a 'replay' and pretend its Christmas all over again and Boxing Day becomes Christmas Day with the stockings and everything.
Not sure how thats going to work out in future years now we've got DD2 though!
How do you do it, especially if you've got a 'step family'? Just curious as I love to hear how different we all are!