We usually do Seven Fishes on Christmas eve, although for awhile when it was just DH and me, that meant seafood chowder and crunchy hot rolls. Currently we are a family of 5 with one who really doesn't like seafood, so we'll see. Still might be seafood chowder and something for my non-fish girl, or I might do a baked stuffed casserole of shrimp, haddock, and scallops (she likes scallops) or something like that.
Christmas day is usually snacky things. We'll make hot dips, get a veggie tray, wings, maybe a cheese fondue or something like that. I realized about a decade ago that I was spending all day in the kitchen while everyone got to use their new presents, play games, and watch TV. I want to read my Christmas books! Also... in my family, Christmas dinner was always a big prime rib. Nobody here eats that way anymore, so even if i wanted to make one, nobody would eat it but me. SO... easy is the name of the game for Christmas dinner.
(For Thanksgiving we've been having duck, but last year we got a smoked turkey at Sam's and man, was it good! I think that's what'll happen this year, too.)