The key transmission vector for COVID is being in an enclosed space for long periods of time.... aka, Christmas.
So my family and I have decided to break it up into two shorter days. An hour the first day, two the second day. Enough time to get together, share conversation, time, some food/drink, while still diligently maintaining social distance (except for my Dad's and my "elbow hugs", where we touch elbows together only).
Go. Wear a mask. Leave early. That way you can take personal responsibility for minimizing your exposing the rest of the family to anything, while also taking part and being together.