While Excavating Past, John Irving Finds His Family
Article on author John Irving, 53, whose latest novel, Until I Find You, which is due out in July, deals fictionally with personal secret--that he was sexually abused by older woman when he was 11--and other themes in his life and work; Irving comments on searching for and finding out truth about his biological father, John Wallace Blunt, despite earlier denials that he was interested in doing so; describes writing book while undergoing search, rewriting manuscript from first person narrative to third and what it has meant to unburden himself; photos (M)
