oh geeze, yeah sorry. The nutcase Hs being horrible to their kids seems to be a trend, right now. Your H wanted to take you to court regarding the kid's visits, then...
Right, so the kids get to choose. That's the same where we are, once the kids turn 14.
Unfortunately, there is no solution for you. Obviously you can not force the kids to go and if you tried, your kids would be angry with you, as well. He is going to further destroy his R with the kids if he keeps this up.
Just be there to support the kids and validate your kids feelings.