Some of your original post is hard to follow as it's tough to figure out whether some of the names you're calling him are accurate or somehow stuff you've made up for him.

Mr. Postman? Is he a postal worker/federal government employee? If so, you should have (about 12 years ago) provided a copy fo the decree to his HR department and gotten them to send you copies of the kids' insurance cards, which might have solved all this. The government doesn't much approve of deadbeats in it's employ, and would certainly follow any garnishment direct-pay setup you'd made years ago. If whatever is the current order for that is paid up as of the end of every year, you do owe him the value of whatever exemption he is supposed to get every year. And if he is paid up on support because it's taken by wage assignment, but not paid up in unreimbursed health costs becasue it's something you have to present the bill for an dge payment afterwards, then it's kind of no wonder that he's withholding payment, if you've improperly refused to give you the exemptions for the kids on his income taxes every year.

If that is the case, then you might want to re-think spending your money to file contempt on the medical thing... he'll turn around & file contempt on the exemption thing and the court might consider it a wash (or worse, might actually add up the numbers and if the loss to him was bigger than the loss it should have been to you, they might end up making YOU pay the difference). And you'll have paid a lawyer to file contempt charges for nothing.

Finally, if you are upset that he's not gotten raises in the past 12 years and want proof that he's lying on his affidavits, if he is "mr. postman", a government worker, as you've implied a few times, it's easy enough to get records of his current salary. The government complies with subpoenaea on this stuff regualrly... and it's supposed to also be public record, though the procedures for getting the information via a public record request are almost harder than just issuign a subpoena. You could have had this information a long time ago if you were thinking that it deserved an amendment of the support.

You've not sought an amendment in 12 years? That's too long and you've not been doing your kids any favors by not gettign updated figures for their father's support. But there were probably other considerations in your decision to do this... and I suspect those other considerations might have mae your decision a wise one (however crazy it looks at this point where all we've got to review is your statement that you've had the same order for 12 years while his income has prob ably increased durinmg that time).

Like AnswerGuy said, there's been 12 years for you to get all this stuff straight. Waiting till it's out of control and pricey and then expecting the government to fix it for you is... well, not productive. Challenging jurisdiction at this point is a waste of legal fees. You'd have been better off finding a lawyer in Wyoming, giving them the whole story and getting help resolving and fixing things THERE, from the start.

GOod luck, there's 12 years worth of receipts and contempts and anger to try to sift through, and it's goign to take a lot of patience on your part.