I believe that's where I am. The last alternative you described. I detached from him. The last time I noticed he didn't want to go to school I asked him if he does. He answered 'it is not in my best interest'. I told him that is his decision I can't make him. He has to deal w/the consequences.
On the other hand I can't control W either. And she is the legal guardian. If she decides to send him to his father than that's what happens.