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Chynna Phillips, Mackenzie Phillips' half-sister, is speaking out about those creepy details that her sibling discussed in an interview with Oprah and are also detailed in her new book, High on Arrival.

The Wilson Phillips member reveals that in 1997 she received a phone call from Mackenzie while she was in between flights at LaGuardia Airport.

Shares Chynna, "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. And she went on to tell me that she had had an incestuous relationship with our dad for about 10 years."

That's an awkward and terrible way to find out!

So how did she take the news?

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

Plenty of people, even though we believe Mackenzie is telling the truth.

Chynna goes on to confirm that her half-sister and father did do 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. 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."

The more we find out, the more we feel bad for everyone involved.

Sad.

[Image via WENN.]