Yes the complaining about food is in the nasty ils handbook.

Reading these posts about the il behavior and food is just amazing and all so similar. One year dh begged me to invite the ils over for Thanksgiving. I was already limiting their exposure but I thought I'll give it another try. So I cooked a Thanksgiving dinner. What did the ils do? They brought a cooler full of food. Inside the cooler were plates made up for Thanksgiving. Mil cooked a dinner for them and brought the food on two plates and put them in the microwave to heat them up when 'our' dinner was ready. And yes this was the last Thanksgiving I ever cooked where they were invited. When they left I turned to dh and said...NEVER AGAIN.