Mick and Mick,
Sorry - no I don't.
I'll try and get some information and pass it on if I do.
I do know that the author has access to a great deal of information on Mrs Cronin and other family members, including material collected by his father and recordings of his uncle Michael Cronin.
He was, I believe, put off by a rather unpleasant review of the Mrs Cronin book.
Jim Carroll