Haha I greatly dislike the selfish that do this. Its Child support not your money to do as you please while not taking care of your children and setting them as your #1 priority! Its funny when I hear how broke people are yet tell their children they can't afford things for them while they're out there using the money for themselves.
The number of child support payments for the right amount since he has took ownership/plowing is def. this. But hey let's file an extension to keep running it catches up with your buddy it's called back CS:)