Some say no (Steve85 and Sandi, correct me if wrong, im thinking of you two). Best DB is no family time at all. They need to get used to separate celebrations anyhow.
I'm in same boat. My view is I'm going to do no family time EXCEPT S6 birthday. I simply don't have the heart to face my S6 to skip. W bday coming up too. She gets a card and gift from kids. Which is more than what some here would say. My POV, I don't know of any guy friend or even gay guy friend who would give a gift and card to girl. So why should XH? Give the kids some pens and they can do something. And Sandi has said as much.