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Thank you for clarifying. If he's already got an order, he needs to keep paying, even if he quit his job. Him making a decision to be unemployed is not your child's fault, and your child is entitled to that money. He has to pay the original support amount until it gets modified. He's allowed to request a reduction, but you can bring in your father to testify that he abandoned his job, that he was making $X per month, and that he'd still be making that if he had not stopped showing up for work. What that means is that he's voluntarily earning below his capacity, and child support SHOULD NOT be decreased as a result.
The second item was for it he didn't have court ordered child support. Since you have a court order, don't worry about it.
I hope that helps clarify. Let me know if you have any more questions.