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.
Just had a panicked phone call from my mom, worrying of being busted by the police and getting a 5k fine. Christmas is on standby once again. The most frustrating part about my family (Covid or not) is their absolute inability to make plans without changing the time/date/location at least 3 times. I'll try to talk them into the 2 days / 3h concept, it might actually work.