Mackenzie Phillips Says She Had Sex With Dad John Phillips of Mamas and the Papas

Mackenzie Philips, the daughter of the Mamas and the Papas frontman John Phillips, drops a major bomb of a family secret in her new memoir, 'High on Arrival.' The actress, who has struggled with drug addiction for much of her life, reveals she had an incestuous relationship with her father that started when she was only 19 years old.

"On the eve of my wedding, my father showed up, determined to stop it," Phillips writes in the book. "I had tons of pills, and Dad had tons of everything too. Eventually I passed out on Dad's bed. I woke up that night from a blackout to find myself having sex with my own father." The drug-fueled relationship allegedly continued for a decade.

"One night Dad said, 'We could just run away to a country where no one would look down on us,'" Philips, best known for roles in 'American Graffiti' and television's 'One Day at a Time,' continues. "'There are countries where this is an accepted practice. Maybe Fiji.'"

Despite the allegations, Phillips describes her father, who died of heart failure in 2001, as a "great and terrible sun around which his children, wives, girlfriends, fellow musicians and drug dealers orbited, relentlessly drawn to his fierce, inspiring, damaging light."

Half-sister Chynna Phillips, who was one-third of '90s girl group Wilson Phillips, supports Mackenzie's claims. "Was he actually raping her? I don't know. Do I believe that they had an incestuous relationship and that it went on for 10 years? Yes," she told US Weekly.