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For Matt Katz, a journalist in his 40s, it was inconceivable that his biological father wasnt his father. It was inconceivable that he was half Irish, not totally Jewish. And, it was inconceivable that he had four brothers and sistersliving right near him. The confusion, the secrecy, the mysteryall because the man Matt thought was his father couldnt conceive. So how was he conceived? And who is his birth father?