L.C.
My husband’s family lives far away in Canada. They are lovely, but they aren’t my family. Whenever he wanted to visit, he went - with my blessing. When the kids were little, we only went when the weather was good, as we were driving through the mountains. When they got older and we moved further away, we rarely went as a family. I clicked my heels and paid for his airline ticket. (Sometimes he’d take one child or the other, but they were often busy with school activities.)
If he wanted to go at thanksgiving, I packed his bag, sent him off, and did my thing. If he went at Christmas, it was the day after.
Now that the children are grown and gone, we go as a couple and make a trip out of it. We make the rounds and visit everyone. We sightsee and go to our favorite restaurants. That said, we only go in the summer because it’s cold and snowy and nasty in the winter...
Don’t make a to-do. Pack him up and send him off. If they ask where you and the kids are he can tell them that they had school stuff, it was too expensive, or that he just wanted to visit.
Good luck!