In an ideal world, we would all have very nice and fantastic mother in laws MILs. They would help to care for us and also our children (their grandchildren) in peace.
But unfortunately, that's normally not the case. Our MILs has high expectations of how we should behave and also how we should raise their grandchildren. The expectations / demands are sometimes so unreasonable that we cannot breathe or even relax in any way.
A healthy way to vent our frustrations without hurting anybody, is to use a pen to pin a lady-like voodoo doll You have no intention to physically hurt them, but you so desperately wanted to do something. Just use your pen to pin on the book and write what you think that they should have done.
This is a perfect gift to anybody suffering under the hands of a demanding MIL.