I get half time child support for two children that have lived with me full time for the past five years. It is seldom that they see their father or spend a weekend. If I get child support changed, is it possible to have the change in arrears for the last five years? The father also owes over $10,000 plus four years of alimony from six years ago. Can I have interest added on to this and is there any way to force him to start paying. I do not know where he works but livein state of AZ

You need to take him back to court, look at contempt charges for failure to follow order.

Have you looked into your states child support enforcement department ( if they have one, many states do)