She has only had a handful of days over the past 3 yrs where she would not have been able to handle the kids. And she knows who to call if she can't take care of it herself.
MIL only knew that she was out shopping for a book (she didn't know what kind). MIL is sorry for me. She says she does not know what happened. She knows W has issues. W says MIL is on my side. However, in the end, MIL will always support W no matter what happens (as it should be).
