What I want to know is does anyone have any advice on
how I can speak to my son on why he's telling these lies?

I think you gotta keep your son out of this.

If it
somehow comes across that I am "coaching" my son for his therapist
sessions, I can get in trouble with the courts. If he continues,
lying, I can get in trouble with the courts. It's a lose-lose
situation.

What bothers me is that you seem more concerned about how this affects you then
the fact that your son is in the middle of a battle. If it's bad for Mom to
use him, it's bad for you. If she's coaching him to say things, it's not his
fault and your talking to him will cause him even more trouble. Get a lawyer
and keep your son out of it. Don't even talk about Mom with him.

Joelle