MacKenzie Phillips’ siblings Bijou Phillips and Chynna Phillips have come forward regarding their sister’s sexual relationship with their father, John Phillips of the Mamas and Papas.

Both siblings stand by their sister and say they have known about the incest for a long time. But her stepmother, Michelle Phillips, also of the Mamas and Papas, says MacKenzie’s claims are untrue.

Michelle spoke with the Hollywood Reporter about the day MacKenzie told her she had consensual sexual relations with her father. She said, “She told me, then she called me back and said, ‘You know I’m joking.’ I said it wasn’t funny. Mackenzie said, ‘I guess we have different senses of humor.’”

She continued, discrediting MacKenzie and even taking a stab at Oprah.

“I think it’s unconscionable that Oprah would let her do her show. I have every reason to believe it’s untrue. Oprah should be more judicious about who she has on her show.”

Then she went on to say how Mackenzie’s past should speak for itself.

“Mackenzie has a lot of mental illness. She’s had a needle stuck up her arm for 35 years. She was arrested for heroin and coke just recently. She did ‘Celebrity Rehab’ and now she writes a book. The whole thing is timed. Mackenzie is jealous of her siblings, who have accomplished a lot and did not become drug addicts.”

Harsh words. But Michelle’s daughter Chynna has since explained why her mother responded the way she did. She says she is angry at the publicity.

“It’s not something that my mom wants plastered all over the papers. Am I exceedingly joyful that my family secret that I told maybe my therapist, my husband and my very best friend in the whole word [is now public]? No.”

But she is still standing by her sister. She does admit that the news was like a punch to the stomach when she first found out, 12 years ago. “I was completely stunned. I walked around in a comatose state for about 10 days.”

Bijou Phillips, MacKenzie’s youngest sister, is also standing by her sister but is devastated by the publicity it has gotten. She released the following statement:

“When I was 13, Mackenzie told me that she had a consensual sexual relationship with our father. This news was confusing and scary, as I lived alone with my father since I was 3, I didn’t know what to believe and it didn’t help that shortly there after Mackenzie told me it didn’t happen …. 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.”

MacKenzie Phillips’ Oprah interview is set to air today and we have learned what her shocking secret is.

She slept with her father, John Phillips of the Mamas and the Papas.

MacKenzie says that in 1979, the night before she was to marry Jeff Sessler, a member of the Rolling Stones entourage, she blacked out on drugs and awoke to her father having sex with her.

“On the eve of my wedding, my father showed up, determined to stop it. I had tons of pills, and Dad had tons of everything too. Eventually I passed out on Dad’s bed. My father was not a man with boundaries. He was full of love, and he was sick with drugs. I woke up that night from a blackout to find myself having sex with my own father. Had this happened before? I didn’t know. All I can say is it was the first time I was aware of it.”

This was not your normal case of incest, the sexual relationship became consensual by 1980. That same year MacKenzie was fired from One Day at a Time and she and her father attended rehab together, which I believe was in vain because Mac has been in and out of rehabs up until recently.

In my last post about MacKenzie I mentioned that, if you recall, she tried smuggling cocaine and heroin through the airport last year and was caught. She eventually thanked authorities for catching her with the drugs, saying they saved her life. She claimed to have been clean since 1992 – which I have a hard time believing that the ONE time she decided to use was that particular day. I’m sure she had been using up until that point, we just don’t know for how long. The thanking authorities bit seemed like an act for the public.

Talk about a messed up relationship. I feel dirty just writing about it. I am having a real hard time with the consensual part! I can’t imagine being messed up on drugs so badly that having sex with your daughter/father seems OK. No wonder she is such a mess.

I don’t think the story is as shocking as the fact that MacKenzie is willing to talk about it publicly. That has to be hard, making yourself so vulnerable and open.

I still don’t trust her. Not that I doubt her story, again, just her motives.  And is she really clean these days? I find that hard to believe. She seems like a “lifer” to me. Broken beyond repair.

Watch MacKenzie’s interview with Oprah, today at 4PM.

SEE A PREVIEW HERE

McKenzie Phillips on Oprah

MacKenzie Phillips, daughter of John Phillips and former television/movie actress, is appearing on Oprah Wednesday and will be revealing some supposed “shocking secrets” about her family.

In this clip you get a preview of what’s to come.

MacKenzie talks about how her father was the first person to shoot her up with drugs and how Mick Jagger told her, “I’ve been waiting for this since you were 10 years old,” before bedding her. We’ve heard these stories before, but apparently MacKenzie does have a secret she will be revealing on the Oprah Winfrey Show that we’ve never heard.

She’s probably going to say that her dad sexually abused her. I don’t know this for sure, just a hunch.  If this is the case, I wonder how her siblings will respond.

I never know how much to believe of what MacKenzie says. I still don’t think she is 100% sober. I could be wrong, but if you recall it hasn’t even been a year since she was busted for attempting to smuggle cocaine and heroin in plastic baggies and balloons onto a flight. You can never trust a junkie. It makes me wonder what her motive is for appearing on Oprah’s show.