
First you must ascertain which State has jurisdiction of the case. Then it is necessary to review the last court order and determine if a change of circumstances exists. Your son's desire to live with you may be one of many circumstances that the Court would consider. Among other considerations are your child's current living situation, school, involvement in the community, location of other family; the wishes, health of you and your ex, which parent will foster the relationship with the other parent, etc. I suggest contacting a local attorney for a consultation on the best way to proceed. Best wishes!