As for the MIL, just show her you won't discuss the divorce or relationship or anything with her. Your MIL is as big a brat as the W. In fact, I don't see much that you need to discuss with your MIL at the moment.
H 34 W 29 BD 3/12/18 Divorce Busted Spring 19
It is not things that bother us, but the stories we tell ourselves about things.
Please start a new thread and link both threads together.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.