My thoughts are the same as your priest, seems sound to me. Let S15 come to his own thoughts and conclusion.

MC and lack of is between his parents, it's adult stuff. In any case MC is only useful between adults who want to R. So lack of MC may just indicate that.

Don't lie to S15 but don't embellish, Ie call mum a dim-witted idiot etc with low morals, kids generally want to love both parents and it's ok to do that. His R with his mom is really for him to manage on a day to day basis. It's ok for him to say mood I don't want you at my concert but he can't be the boss of mom. She may show anyway.

So get out of the way, let S15 deal with his mum in his own way, tell him you trust him to decide, you won't interfere and are there to support him. No drama. Grey Rock.

My thoughts

V

Freedom is just another word for nothing left to loose.
V 64, WAW