Mackenzie Phillips' 'Courage' Praised By Sister Chynna On 'Oprah'

'She had the courage to come out and talk about it, and I'm proud of my sister,' Chynna Phillips tells the talk-show host.

For the second time in one week, Mackenzie Phillips sat down for an interview with Oprah Winfrey on Friday (September 25) to discuss her allegations of an over 10-year incestuous relationship with her father, John Phillips of the Mamas and the Papas. This time she was joined by her younger sister Chynna.

Via satellite from New York, Mackenzie shared stories of the positive reaction she's received in the past days and responded to critics who questioned her decision to speak out.

"My answer to that is — and I understand this is a difficult thing for my family — nobody's talking about this," she told Oprah. "So if I started a national dialogue that will help people face this issue, I am forever grateful."

After the commercial break, Chynna appeared without Mackenzie's presence, saying she wanted her own platform to communicate her reactions. "I was praying for her the whole time because it is a very, very taboo [topic]," Chynna recalled of her reaction to Wednesday's show. "Many people were repulsed, many people were horrified at the allegations. ... She had the courage to come out and talk about it, and I'm proud of my sister."

While Chynna said she believed there was a consensual relationship between Mackenzie and John, she stopped short of endorsing the entire accuracy of Mackenzie's account, which she details in her new memoir, "High on Arrival." She also admitted that she wasn't pleased to have their private family business made so public.

During the next segment when Mackenzie and Chynna appeared together, Mackenzie said, "I am more in love with my sister than I have ever been ... I'm very proud of you ... I'm really sorry to put you in that position. But I don't regret writing the book."

Earlier in the show, Oprah read a statement from Mackenzie's half-sister Bijou. "When I was 13, Mackenzie told me that she had a consensual sexual relationship with our father," the statement said. "This news was confusing and it was also scary, as I lived alone with my father since I was 3.

"Mackenzie's history with her father is hers, but also clouded with 30 years of drug use," the statement continued. "I hope she can come to terms with this and find peace. The life I had with my father was very different. He was Mr. Mom, encouraging and loving. The man that raised me would never be capable of doing such things, and if he was, it is heartbreaking to me to think that my family would leave me alone with him. I understand Mackenzie's need to come clean with a history she feels will help others, but it's devastating to have the world watch as we try and mend broken fences, especially when the man in question isn't here to defend himself."

Though she said they are still close, Mackenzie said Bijou had not made contact since Wednesday's show.