I have kids of my own who have turned away from the Lord and the teachings of their youth. They know we love them, and that they are welcome at tour home. They also know, and respect, that certian of their behavior is nott to be brought home...amd they do not.
Our prayers, and our love remain steadfast for them...and they know it, and why.
I understand completely...and believe that your friends are taking the path that will provide their son a way home should he ever turn from that life style...and I will pray as well that he does.