Have you sent a written letter demanding payment to him by certified mail, return receipt requested? That is the best way to start. Keep a copy of your letter as evidence in case you do end up in litigation. To enforce spousal support payments that have gone unpaid you will need to file a petition for enforcement, usually in the jurisdiction that entered the final decree of divorce. While you can file this petition yourself, I strongly recommend you find an attorney in your jurisdiction to...
A child support obligor remains liable for any child support to be paid under a court order unless/until the court modifies that order. The court will, however, take into account the fact that the child was living primarily with the obligor during the time the support was not paid. If I understand your fact pattern correctly, it sounds like a petition to modify has been filed seeking a change in conservatorship and seeking child support to now be paid by your wife, who was the child support...
Failing to support a child in accordance with the parent's ability for a period of one year and leaving the child in the possession of another and remaining away for a period of six months are grounds to petition for the involuntary termination of a parent's rights under the Texas Family Code. However, courts can be hesitant to terminate the rights of a parent that is not abusive and has the ability to pay child support for public policy reasons. Courts don't like to legally "bastardize" a...