For me it wasn't so much the content of the Berton book, the disappointment was the lack of material about Bix. Ralph Berton seemed to have only a passing relationship with the man. Btw, I think the alleged affair was with Berton's other brother, Gene.
"Frankly theres not too much in the history of jazz music and musicians that makes for comfortable reading, or offers much hope for humanity,"
Very true, fortunately we have their work to sustain and nourish us.