Thank you, Job! I did write to the therapist to ask, and also to my lawyer, but I wanted to ask here because neither of those people truly understands about MLC. I just wrote to them this morning so I don't know their answers yet but will report back.

But Job, do you think it's best, once I understand about the custody impact, that I just let my S do whatever he wants to do, even if it causes problems with either my battle or just for my S's sorrow getting a potentially crazy letter back? I think I am most of all scared that my S is right and that my H will start trying to get back into his life after getting the letter. I think this would be a very dangerous thing for right now. He is deep in MLC and is a horrible influence on both of my kids and I am afraid of what he will say about me to them, disrupting the shred of peace I have with them after all my intense efforts. Every time he has tried to get close to them it has been in that very damaging and dark way that I have posted about before.

Or do I just assume that even if my H does try a little, that it won't matter because eventually he will disappear as he has been?

I believe I will see the bounty of the Lord in the land of the living.
Wait for the Lord with courage.
Be stouthearted, and wait for the Lord.