Same thing we do every year - we'll go to mass at 4 p.m. It's a mass of the Christmas Story. Then we'll go to visit my grandfather in his final resting place (the cemetary is on church grounds).
Head back to our house with my family, have hors de veurs & sandwiches. Open gifts, play some games, lots of talking, lots of pictures. We'll watch outside for Santa (for my 3 yr. old nephew).
Girls will go to bed around midnight or so. We'll bring the gifts down & then it's off to bed for us. Our girls are teens now, so they don't wake up too early anymore on Christmas morning.