hi there...
I am sure your IL's are so embarrassed by your H's behavior. My IL's were mortified by the way H just up and left...

Try not to let their anger fuel you. I used to talk to MIL all the time and the one time I stood up to H regarding visitation of the children my IL's said H and I were both stubborn and they didn't appreciate not being able to see the kids. Mind you, I never held the kids from them but H was not following visitation so I told him follow it or don't take the kids...so he didn't on a day the Il's were supposed to see them.

They kind of blamed me too, and now they don't even talk about what went on while we were S...kind of like it never happened. Not sure I like that either!

My IL's are fantastic people but they are still H's family. I guess what I am trying to say is to use them as a support system but don't let them pour too much of their disgust about H on you. If H and his mom reconciled their differences tomorrow, would she still continue to be a true supporter of you?