I loved reading everyone's responses - some great traditions going!!!
In the early afternoon on Christmas Eve we have my in-laws over (MIL, BIL and his family) and have gift exchange with them. I always fix something relatively easy for lunch since we eat early (like noon or 1pm). Usually bake a ham, homeade mac n cheese or scalloped potatoes, green bean casserole, etc.
Then we always go to 5pm Christmas Eve mass with my family and then to my parents for dinner and open up gifts to/from my parents, brother, sister, and their families. We usually hang out there all night and play games (find the pickle on the tree) etc. We don't get home until 11pm usually.
Christmas morning - we have opted to keep it just to our family (husband, step-son, and 2.5yr old son) since Christmas Eve is so hectic and busy. I always make sausage/egg/cheese casserole, fruit salad, and cinnamon rolls for breakfast and we open up presents while it is in the oven from each other and from Santa. And the kids can just hang out and play with their new toys. And we watch National Lampoon's Christmas Vacation, Elf, Polar Express, Christmas Story, etc. all day long and have leftovers to eat. We even stay in our pj's until after noon!!
Our biggest tradition is that we take turns opening presents (youngest to oldest) no matter which family get together we are at. That way the opening presents takes longer, you can enjoy it longer, and you can take pictures and see everyones faces as they open the gifts and see what they got!!! It is really good for the little ones too... they pick out a present and hold it, staring at it, wondering what it is until it is their turn to open. So adorable to see them so excited - but yet know they have to wait until it is their turn and all eyes are on them!!!
Day after Christmas... My mom, sister, aunt, and I go shopping for deals starting at 6am!! We have been doing that for over 20yrs. We don't buy much since everything is on sale before Christmas so much these days... but it is fun going. We usually shop til we drop until 5pm! The kids are home with their dad all day playing toys and hanging out. Good for them to have that time with their dad too!! Fun times! Looking forward to this year!