It is very small thing, but life is built from small details. I suggest you pay more attention to them next time. Because things are so small, so just let them take advantage of it as they needed.I can see they are tough parents in law, but also I can see you are not a good at the situation live with in law. I would never pick up 5 ribs and leave only 2 to 2 of them. Even with my own parent, I want to give them more than I have. Just a reference, hope you can see you self better.