Where the kids were taken and where the agency is that took the child.

California has Court forms to assist in domesticating the sister state judgment that you can do yourself if you follow the requirements. Or you...

You probably cannot file a mechanics lien as you have been paid. Your customer has no valid reason to contest your charges.

Some family law attorneys collect judgments or there are attorneys who collect judgments for individuals such as you-Judgment Collection Attorneys...

Consult with experienced financial elder abuse attorneys in the state where this occurred.

Contact the DMV if they have a program to obtain title in this circumstance.

Unless there was fraud involved, you cannot sue because you overpaid for the car.

Depending on what the contract states, yes you could get sued for the money due.

If they have a valid judgment that was properly renewed the can continue to garnish.

Yes you have potential lawsuits. Consult with experienced attorneys in the state where this occurred.