Michelle Phillips

Michelle Phillips

Mackenzie Phillips, left, with TV sister Valerie Bertinelli, had sex with her father, the musician John Phillips, the night before she got married. Phillips writes about her relationship with her father -- "not a man with boundaries" -- in her new memoir, “High on Arrival," and is set to talk about this deep, dark family secret today with Oprah Winfrey. “He was full of love, and he was sick with drugs," Phillips writes of her father, according to People. The elder Phillips, who died in 2001, had shown up the night before his daughter was set to marry Jeff Sessler, a member of the Rolling Stones entourage, in 1979, and was determined to stop the wedding.

The following year, she was fired from “One Day at a Time” because of her drug problems, and checked into rehab with her father, at Fair Oaks psychiatric hospital in Summit, N.J., along with his third wife, Genevieve Waite, in " a counterculture parody of family togetherness," according to a 1996 People magazine article. At the time, the People reporter didn't know the extent of the togetherness; father and daughter had continued their sexual relationship.

Phillips' mother was Suzy Adams, a socialite, but Adams and Phillips divorced in the early 1960s. Phillips later married Mamas member Michelle Phillips, with whom he had a daughter, the singer Chynna Phillips, now married to Billy Baldwin. John and Michelle Phillips split, and then he married Waite, with whom he had two children, the actress Bijou Phillips and musician Tamerlane Phillips.