If mom is asking that son be returned, then either you already have custody so no need to request it or CPS has taken custody and jurisdiction.

…only if other parent is willing to accept it as a substitution and agree in writing.

As long as there is no intent to permanent reside outside the state, and there is no prohibition in your custody orders, yes

Hire an attorney in Texas if possible but show up at the hearing and tell the court that you were never served. It might matter as to what custody...

All income is considered for spousal support.

How do you think? You should be discussing this with her.

You have offered no factual evidence that her use of marijuana (if that’s it) puts others in danger. Many would disagree with your assumption.

Offer your reasoning to him and see if you can convince him to at least assume more than 50% of the driving since he moved. If you go to court,...

…and be prepared to begin to pay child support if you are correct.

You probably have the right the request 1/2 of the claim - depending on the nature of the injury to the property.