Patrick Hemingway hadn't seen his father in more than a year when the two met at a Missoula, Mont., motel in June 1996. The son knew things would be different. Still, he didn't know exactly how different, until he saw Gregory Hemingway -- doctor, writer, elephant-slayer and son of Ernest -- perched on a bed in a dirty-blonde wig, a blue dress, pearl necklace and high-heeled pumps. He'd had a sex change.''It was a little unsettling,'' Patrick recalls. ``I didn't know how to address him.''The anguish over gender identity that drove Gregory Hemingway to become Gloria Hemingway has outlived him...