You will likely need to hire a private investigator to see if they can follow him around to show the court he does not live there.

if the mother is not willing to do one voluntarily, then you will need to file a court action to have it done.

Unfortunately, that is impossible to tell you, especially in a forum like this. You may want to consider having a consult with an attorney and...

You may need to file a motion for emergency custody if not returned as is set forth in the order. You could also fly down there with the court...

Ask her about. Depending on how she responds, then perhaps you will need to contact the authorities. You should also perhaps get a PO box and...

See if you, the mother, and son can work something out, if not, you may need to file a motion to modify custody/visitation.

The quickest way to do this is to have a signed agreement between the two of you that resolves all issues and do an uncontested divorce. ...

Although the court could do so (they have the discretion), I would be surprised if they actual do it though.

Until someone files a motion to modify child support and the court grants that motion, child support is still owed.

I am sorry, but no one can answer this question without reviewing all the documents that were filed with the court.