He has only made one payment of 400dollars since he was court ordered and he gets to see the kids when he wants and he gets weekend and he is about to re marry
You can file a motion to enforce child support through the Attorney General's local office. They will confirm his child support arrearage, and give him the chance ( or 2 or 3) to make his payments more regularly & consistently, and if he doesn't, they will invite him to spend a few months in jail. At least he does have a relationship with his kids. That's a good thing.