Chynna Phillips
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Her sisters are upset, her stepmom calls her a liar, but Mackenzie Phillips isn't backing down from her claim of a long-term sexual relationship with her dad.

She hopes to become the public face of incest, not a post anyone would want to hold, but one that represents an issue she says gets too little attention.

"If I've started a national dialogue that's going to help people face these issues, then I'm forever grateful," Phillips, 49, said Friday via satellite on Oprah.

Mackenzie Phillips, who revealed her shocking secret in a new memoir, High on Arrival, appeared for the second time this week on The Oprah Winfrey Show.

She returned to Oprah to face the doubts from her family about the nature of her relationship with John Phillips, founder of the band The Mamas and the Papas.

Bijou, Chynna and Mackenzie Phillips.

On Friday's show, Winfrey read comments made by John's ex-wife, Michelle, who was also a member of the band and later Mackenzie's stepmother:

"I have every reason to believe it's untrue," Michelle Phillips said, adding that Mackenzie has a history of mental illness and drug abuse.

Mackenzie Phillips, who also says she became pregnant, possibly with John's love child (which she aborted), didn't take the accusation sitting down, although she has by no means attempted to deny her long and troubled history of drug use.

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Seemingly out of nowhere week, we saw Mackenzie Phillips on Oprah, revealing a long held family secret - that she had a 10-year sexual affair with her father and possibly even became pregnant by him before having an abortion.

Well, we haven't seen the last of the 49-year-old on the daytime talk show. Mackenzie is returning to The Oprah Winfrey Show tomorrow (Friday) afternoon.

Joining her? Half-sister Chynna Phillips, who spoke out this week in support of Mackenzie, who she says confessed the affair to her 11 years after it ended.

Mackenzie will appear via satellite on Friday, while Chynna will be live in the studio. It is not clear if the two will interact or if they'll appear only separately.

Mackenzie Phillips, left, and Chynna Phillips.

On Wednesday's show, Mackenzie confessed her long-running, drug-addled sexual affair with her dad, John Phillips of '60s band The Mamas and the Papas.

She said she became pregnant and didn't know who fathered the child. She had an abortion, which her father paid for, "and I never let him touch me again."

Chynna later revealed her side of her sister's sad and disturbing story, which Mackenzie is making public for the first time in her new memoir, High on Arrival.

In an interview, she said that news of the affair sent her into "a deep, deep sadness and depression for about 10 days. A part of me died when I found out."

It will be interesting to see what transpires on Friday's show.

In her new memoir, actress Mackenzie Phillips scandalously and disturbingly reveals that she had a 10-year affair with her father, musician John Phillips.

It's an outrageous claim, but likely (and sadly) not an untrue one.

Mackenzie's half-sister, Chynna Phillips, backs her up all the way.

Chynna, of the hit 90s group Wilson Phillips, shares her side of the sad tale, recalling how she once got a call from Mackenzie, now 49, in 1997.

This was 11 years after the affair had ended. Mackenzie Phillips spilled to Chynna, now 41, all about how their father had an affair with her.

"She said, 'I don't know why, but I just really felt the need to call you and tell you something that I think you need to know,'" Chynna Phillips said.

Chynna Phillips believes Mackenzie's story 100 percent.

"[Mackenzie] went on to tell me that she had had an incestuous relationship with our dad (of '60s band The Mamas and the Papas) for about 10 years."

When the affair began, John Phillips was married to his third wife, model Genevieve ­Waïte. Chynna's reaction, not surprisingly, was total shock.

"Somebody could have dropped a piano on my head and I probably wouldn't have felt it," the singer says in an interview with Us Weekly. "But I knew it was true. I mean, who in their right mind would make such a claim if it wasn't true?"

She says the news sent her into "a deep, deep sadness and depression."

In her book, High on Arrival, Mackenzie Phillips also claims she and her father did drugs together and that her father "shot me up for the first time."

Chynna confirms this as well: "They were both doing drugs together."

"After long nights of heroin use, she's claiming that she once woke up and that my father was on top of her having sex with her," Chynna said.

"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."

Mackenzie Phillips and her father, Jon Phillips.