I know when I was a baby and my parents divorced(my Dad caught my biological mother in bed with someone else) he told her it is all or nothing. If you have the kids I will pay whatever but I will not be in their lives and vice versa. Very unusual but my Dad got full custody, she didn't even show up for the hearing.
I didn't know all of that until my own Divorce. Maybe it only worked because I was a baby and my brother just a year and a half older. But most of my life I have wondered about her and how my life would have been. I have exchanged some letters and she was just way too friendly right out of the gates for me and told me lots of lies about my Dad. Needless to say, I was better off with my Dad. My Mom is the only Mom I've known though I do remember my Dad dating. Mom and Dad got married when I was 2.
I guess what I am trying to say is that it will work out and your kids will always know who the stable force is in their life. If it is your W's turn for the kids and she decides to do something instead then she has to pay the sitter. Yeah it may get to the point where she won't be there, I don't know, but it will be her loss.
hang in there.
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory