I'm starting to lose the plot and need to know how to manage his behaviour to stop it damaging DC further.
He now gaslights the DC the same way he used to me. Manipulates, controls, basically makes their lives as unstable and lacking in routine as he can.
DD has a mental health issue, she is seriously ill. Her therapy team are well aware of his issues and desperately trying to get her better despite his undermining her and them at every turn.
NC is not an option as they think the drama that will cause will make her more ill, something that can't happen.
Example, I have to make a decision on schooling for her. Every option I come up with is knocked down by him but yet he insists he is involved! He will happily run down all the choices in front of her when she isn't mentally capable of handling that.
So I need suggestions from anybody who has learned to deal with someone like this whilst protecting their DC.