SEASON 1, EPISODE 101 | AIRED ON 08/28/12
Of all the confessions in the Oprah Show vault, TV Guide Magazine picked this as the ultimate shocker. On September 23, 2009, former One Day at a Time star Mackenzie Phillips appeared on The Oprah Show to reveal a family secret she'd kept for years. She told Oprah that she'd carried on a sexual relationship with her father, John Phillips, the founder of the Mamas & the Papas, for approximately 10 years.
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