Last year around mid December I got sober and stayed that way through the beginning of March before I blew it for about 2.5 weeks (I'm grateful I got back on track rather quickly). I made it through the holidays and the Super Bowl sober. I avoided being around people who were drinking...that was the only way I could do it. I think I'll be able to handle family functions this year. I doubt anyone will notice I'm not drinking.
Hang in there, VC. Easier said than done. If certain functions are unavoidable, find sober people to talk to.