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Dear JACUSTOMER - If you have a court order that he is supposed to pay for insurance or child support or anything else you can certainly file a motion for contempt if he doesn't pay. I would assume the child support has ended for the 20 yr old but you can ask for an increase for the 15 year old if there is a change in income levels from 15 years ago which I assume there is.
You would file your motion in the court that issued the order for support. If there is any support that has not been paid you can also file a motion for contempt for non payment of that amount.