Chrysta Bilton's mother was a lesbian who asked a man she'd just met to be her sperm donor. It was only much later that Bilton learned the same man had donated sperm to countless other women. Bilton tells the story of uncovering her 35 siblings and her unusual childhood in her memoir Normal Family. TV critic David Bianculli reviews the new HBO reality series The Rehearsal, where participants practice real-life scenarios.