What do you mean by "she refuses to pay her portion of the divorce to get it finalize"? If the issue is that his ex-spouse won't comply with provisions of the court order, he can take her back to court and seek enforcement.

You state that the mother is "recieving public assistant for the 2 children to attend school". Exactly what are you talking about? If in fact you are talking about public assistance, the state would normally recoup money from the support payment and forward any balance to the recipient, but we have public schools in this nation so superficially your claim doesn't make much sense.