Linda, sounds as if your DI L's need to be asked. They may think that you want the dinner to be your way. They may have some favorite dishes that they could fix. Have you been to their house for a meal? If so, you could say that you enjoyed that particular dish a lot and could they bring that along. I guess I have never been to any meal where if you don't bring something, you at least are in the kitchen helping to fix the meal.