Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
Unfortunately, if you have joint custody
, the parents are to share in these decisions. If he wants to try school in AZ and she refuses to work this out, you cannot keep your son without a court order. If you believe he is old enough to make this choice and there are issues between siblings more than ordinary sibling conflict, then you need to go to court now, immediately, to seek an ex parte or temporary order
of custody based on the behavior issues and the fact he wants to go to school in AZ which would be in his best interest and in accordance with his wishes and a court has to decide.
If you just keep him, she will pursue you for contempt.
I suggest sitting with her seriously and having the conversation about behavioral issues and school may be better for him in AZ at least temporarily and even agree to put it in writing to evaluate his school performance and behavior at the end of the first half year and if it has not improved or he wants to return then you would return him to her.
The courts really expect to see parents discuss and work out these problems between themselves and not in court if at all possible, so that should be your first step and if that fails you have to file an emergency or ex parte motion in court where the custody order was issued to get the court to give you an order to allow this change.