I'm glad they aren't coming to your house. I can't imagine that scene. I'm so sorry you have this stress right now on top of everything else. You are the last person in the world that deserves any of this.
Focus on what you can control and what gives you joy. What special things are you planning for the holidays with your kids? Think of some of the special traditions that you can still continue that will bring warmth to your heart and theirs. Maybe you can think of some new things, too. Are there things you always wanted to do, but knew your H never would have "gone for it"? Do those things.