I don't like to celebrate major holidays with extended family, other than July 4. I think I like that holiday because we can all be outside doing stuff, instead of stuck in the house. Usually we stay home with our own kids and just have our little Thanksgiving or Christmas, complete with our own traditions. We very very rarely have family drive up to celebrate with us(it's 400 miles.)
Last year we did take the camper down to Florida so we could celebrate Thanksgiving with DHs sister, BIL, and mother. With the camper we had our own place to retire to, rather than bunking with his sister & BIL. But the day was a disaster. DD16 was very sick with pneumonia & asthma, t103. My SIL wanted to cook the whole meal despite my pleas to let me help(*I have a stove, oven & microwave in the camper.) She didn't thaw the turkey ahead, she made only 2 cups of collards greens, a little dressing, no cranberry sauce, and a big bowl of mashed rutabagas.

There wasn't nearly enough food for 7 people and the kids went hungry for lack of stuff they would eat(and my kids are not picky eaters!) Not only that, but she wanted us to stay all afternoon. They don't watch TV, didn't want to put a tree up, didn't want to go for a walk. Just sit there and talk. Well, I'm sorry but I have this mentally retarded 14yo who can't sit still, doesn't play with toys or watch videos. He's a handful anyway, but in a situation like that it's really difficult. SIL & BIL don't do anything to help--in fact, they don't want him to touch them. They don't want him to touch anything. Bil goes around behind him sweeping the footprints off the carpet and wiping the counters. It's really uncomfortable.
The worst part, for me, is that I could't get away other than to take Christian walking. So that's what i did. Five hours of walking Christian while DH sits around and talks to his family. (To give him some credit, DHs lung/heart disability precludes him from all the walking. He can no longer handle Christian by himself.) So it's an exhausting, miserable day for me. I was never so glad to get back to our campsite where we could let our hair down, get some real dinner, and not worry about what thing Christian might get into next.
I am sooooo glad we stayed home this year!