Can ex be charged with custodial interference

I live in NYS and have sole physical and legal custody of my 15 year old son. Father has never had any physical custody, but recently also lost legal d/t issues with alcohol. Current court order states visitation is to be determined between the children and the father. I have my son spend the time he would like with his dad, which is per the court order that I, the judge and the law guardian felt were in the children's best interests. Now, dad is enticing and encouraging my son to live with him (while maintaining little to no contact with our daughter who is 17). I have told my son he may resume overnight visitation if he wishes, and that seems to have calmed at least him for now, but dad is still trying to guilt him into moving in with him. Can he be charged with custodial interference, and if so, how do I go about it. Son is conflicted and again seems content with overnight visitation, as up until now has only gone for the day, etc.