Triangulation - what to do when a child is caught in an adult game?

[Swiggle]

From another thread someone suggested I post this here.

How do you help a child get out of triangulation?

My ex is classic NP and my D11 is being triangulated with his gf. D11 sees a T but I don't think her T truly gets his NP traits and what he is capable of. What can I read, research to help my daughter? It is getting worse. I think ex keeps D and GF at odds because they both compete for his attention.

The T that DD sees dad insisted she have a masters in pyschology, now in a converstaion about finding someone new he is stating the next person must be a doctorate in psychiatry. I asked him if he really knew the in depth differences between those and a Therapist. He really doesn't. Part of me thinks he wants her medicated, he tells her all the time how crazy she is and has her questioning everything she thinks and fees.

I know what the madness is like living with him, I don't want my daughter to be a victim to her dad.