Round of applause for cousin, cousin hubby and mil!
This cannot possibly be serious. Taylor is not a coffeemaker that overflowed because this guy put too much water in it and now he's being left to clean up the mess. Taylor is a child, who is being tormented by this man, who she is supposed to be able to love and trust. Sure an adult should have t "suffer the consequences" of his own actions, but I don't believe dealing with a temper tantrum is the same as suffering consequences; at least not in this situation and not the best or most effective way.
Frankly, the more important issue here is protecting Taylor from being abused. If she were my child, he would not be allowed to have any contact with her. Period. As far as the MIL not getting to see her granddaughter, well, it's unfortunate, but Taylor comes first. (And again, I am speaking only for myself here). If Taylor were my child and the MIL and FIL were my parents (or in-laws), I would have a serious talk with MIL and tell her that we love her and want her to have a relationship
with Taylor, and would do anything and everything we could to make that happen, but it had to be without FIL. We could spend time together when he had other things to do or other people to spend time with.