You should contact the attorney who assisted with the prior court proceding
This is not intended to be legal advise or as legal representation. I am a California personal injury attorney . Be aware that every state has its own statute of limitations; and statutes & case laws that govern the handling of these matters.
Contempt is a very detailed and fact specific action, and needs to be plead correctly. You should contact a lawyer immediately to assist you if you are serious about filing a Motion to Enforce.
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However, it appears that you have learned that Mom has moved. The first thing to do is for Dad to call, text or email her and ask for her new address. If she won't reply then contact her former landlord and see if the landlord knows her new address. I assume that you are attempting to find out where the child is now living so that you can pick up the child for visitation. Do some "detective work". Even if you hire an attorney, you are going to need to "serve" her with paperwork work to file a contempt action against her.
If, however, you know where she is living with the child and you just want to file contempt on her for not properly notifying the Dad about moving, I woud think twice about spending your money. Most judges don't have the time to waste on technical violations. Most judges won't punish the Mom if she eventually notified Dad & he did not miss any visits with his children.
I hope this helps. Good luck finding Mom & the kids -- which is what I assume is what you are trying to do.
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