I'm so sorry you are facing these heavy questions in your family.
I am glad you found us, because I can assure you that we "get it".
I had the exact same reaction to reading stop walking on eggshells (SWOE) and I remember questioning my sanity.
It's good that you have professional counselors involved...very good. Have they given you advice about the questions you have raised? Can you share it here?
Communication is important, yet I hope you can appreciate that "how" you communicate with a highly emotional person might be just as important as the actual content of what you say. We can give you some pointers and things you can discuss with your counselors.
How does that sound?
I'll come back soon to check your reply.
Best,
FF