It's such a bummer that you have to go through that. You could try reading _Boundaries_ by John Townsend
or you could tell him you'd like to help, but you're going to be out of town yourself (then close all the curtains, or actually take a little trip)

You could ask your lawyer to see if you can up the child support $$. I doubt if you'll get $$ from him otherwise.

It's obvious that you just want what's best for the kids. Good luck.