Kurt,
its going to be even harder that she has shown him the letter, and he has denied it.
Worse still, she believed him, but did she look him in the face when she shown it?
You have to keep your mind safe, and it is number one priority.
Refuse point blank to go there.
How could she accept that you are lying if it happened to her own son, who she should protect.
Can I ask one question here, and it may sound superficial.
Does your mom have some sort of 'love' thing, or crush on Adam?
So she would bring him into a relationship and drown out your relationship with her.
She could be seeing you as using him as a way of forcing her relationship apart from him.
Just what I am thinking right now, but it could be crucial.
If he is using your mom to gain access to you, then you cannot let it happen.
I can think how hard it might be, but I cannot be in yr shoes.
Your mom should take it more serious, but is she so far from listening in her own self centred way.
Child abuse from someone she trusts is sometimes what a mother cannot even think of, but her job should tell her otherwise.
I wish I could be there when you go to that house, and I would get him telling the truth.
Keep yourself safe Kurt,
ste