When a child is this disobedient, he should be disowned. That may wake up some of these transgenders who are swept up in this fad that could destroy their lives. A parent cannot stand by and watch their child mutilate his/her body with no consequences to their relationship.
But it occurred to me one day that my role as a Father to my kids is similar to that of the Heavenly Father towards us. We know from Scripture that God never gives up on us, no matter what we do, so I now try to remember that with my own kids.
I suppose that argument only works if you are a Christian, though.