They have officially pissed me off

The in laws. Gosh, sometimes I think I might honestly hate them. Bryan and I decided that the kids and I would not go to his sister's house for Thanksgiving dinner today. We have spent most of the last week at his parents house visiting with family. He had to work today and I didn't feel like driving for 2+ hours with his dad. So mil calls this morning and asks if Savanna can go. I said yes honestly expecting her to let Sam go, too. She didn't. I should have said no. I'm so mad at myself for saying if they both can't go, neither of them can go. Sam has been sobbing he is so upset. I so don't know how much longer I can deal with them. I am ready to quit going to family functions. I don't deserve to be treated this way and neither do my children.