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Mackenzie Phillips Mackenzie Phillips has been keeping one heck of a family secret to herself: She and her father, John Phillips, of The Mamas and the Papas fame, were involved in a consensual sexual relationship that went on for years. The former One Day at a Time star first recalls having sex with her dad the night before her wedding to Jeff Sessler, who was a member of the Rolling Stones entourage, in 1979. People.com has released this excerpt from Mackenzie’s tell all book: On t |