See? That's why I said never say never. After last year's debacle, where MIL expected BOTH Thanksgiving and Christmas, I said that I would NEVER, EVER give them both occasions. Well look at me now, Christmas will be at the IL's, but *I* am hosting Thanksgiving (with them). I also said that I would NEVER invite them to my Mom's cottage. Look at me now!
Yes, I would expect them to bring the "groceries" for their meal (except for s+p, butter, ect). So bread, eggs & bacon (or whatever) for a breakfast, a crockpot of meatballs (or whatever) for a supper. But that's why I'm asking, because it's the "done" thing with my FOO. Each "family" is responsible for one meal, one cousin brought pulled pork, with a salad and buns, my aunt brought a pasta casserole with garlic bread, another cousin brought steak & baked potatoes. It's not even a question of the cost, it's a matter of spreading out the planning. And since people usually offer to bring SOMETHING, it's nice to have an idea ready for what they can bring.
So if the IL's don't offer to bring anything, it won't bother me. I'm sure there will be more than enough food, and we won't have to live on cat food for the next month or anything either. I'm also planning for my turkey on the Saturday, so we'll have leftovers, and I'll make some SOUP!