Only you're alone. It'd be nice to be able to call them friends. But probably not this year. Of course your kids want to see their father or their mother, your ex or soon to be ex, and they're not too happy that you won't be spending the holidays together like before. There's a bright side, though, they get two Christmas mornings, one at your house, one at the other house, and that should mean double the presents.
Holiday cards are a problem.
Maybe no cards this year is the best answer. What about the phone calls from relatives and long lost friends, the ones who keep in touch once a year. What the holidays do is open the wounds, make them hurt particularly painfully during a time that you're supposed to be happier than usual. How does that stop the pain that comes from having a husband say he's tired of being married, or having a wife say she needs to find herself - alone. How about those holiday parties everyone is having and they'd like to invite you, but your ex is going to be there so, maybe some other time.