Yep, living with an unmedicated bi-polar left it's mark on me and the kids.Mom is a title of utmost respect, especially around here. Take it as the complement that it is.
Physical abuse should absolutely have been enough to prompt the divorce. But that's a whole other topic.
Dad will not be able to terminate his rights and he will have to keep paying CS until they age out, whether he likes it or not. It is possible that he will eventually reconcile with them. Try to hold out a little hope for that - though it may take years if it happens at all.
If he's successful in his threat, that will be his choice--not mine (well, I guess the judge will have the ultimate say). Whether he continues financially supporting the children is not my decision. Our state has a specific formula, I don't have any say in the way it is calculated. And again the judge has the ultimate say. Fortunately/unfortunately the kids are of the age where our state does place credence in their opinions regarding parental issues.
My heart breaks for the kids because they feel they have been thrown overboard by their own father in favor of his new family. And in some respects I feel sorry for him because he's missing out on two pretty good kids.