Yeah Lori, there is no normal anymore these days...when I was working as a paralegal, we had so many cases where the parents just could not get along and did horrible things to each other...and none of them cared what it was doing to the children...we also handled a lot of cases where the grandparents had to step in because the parents were so messed up and couldn't get it together...it's really a sad state of affairs what this world has come to. 
...even if it's a bit extreme! 
Hahaha...I have to say I like the way you thinkGood afternoon all!
No need to go through all that. Just give DIL small cute pet, like a duck or a bunny, something you can eat. Let her grow attached to it. Then when she makes some ridiculous threat about withholding your granddaughter, pick up the pet and snap it's neck in front of her and say "Do you really want to go down that road?" Then cook up the duck or rabbit and enjoy a nice meal while you stare at her menacingly. You'll scare the crap out of her. Oh, and make her eat too.




