You think you're going home for a nice, peaceful holiday with the family, and then...
Honestly, I don't know what Frank Black is on about half the time. And frankly, I don't even know if this song is about holidays, or Christmas.
It does appear to be about incest, for what it's worth, which—admittedly—isn't generally associated with Christmas. But I recognize that tone, Frank Black: you sound like someone fed up with your family. That family that's telling you that you're just not good enough, and asking you how you've disappointed them this year, &c.
Well, so, the message, from me to you: don't sleep with your sister, & don't let your family fuck up your holidays this year. Merry Christmas!