The fallout from Mackenzie Phillips’ “I Had Sex With Papa John” Bombshell has been heartbreaking for the actress’ youngest sister, model Bijou Phillips.

Mackenzie returned to The Oprah Winfrey Show Friday with half-sister Chynna Phillips, of Wilson Phillips fame. While Chynna believes Mackenzie’s claims that she had a 10-year-old incestuous affair with their father, rock icon John Phillips, Bijou, on the other hand, can’t believe the founder of The Mama And The Papas could be responsible for such a crime against morality.

The 29-year-old model refused to appear, but supplied a statement to Oprah, claiming Mackenzie told her about the sexual relationship with their father when Bijou was 13 but later denied it.

“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,” Bijou says. “I didn’t know what to believe, and it didn’t help that shortly there after Mackenzie told me it didn’t happen. Mackenzie’s history with our father is hers, but also clouded with 30 years of drug abuse.”

She also questioned why Mackenzie, 49, would leave her alone with their father if he’d already assaulted one of his daughters sexually.

“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,” she continued.

“I understand Mackenzie’s need to come clean, but it hurts because the man in question isn’t here to defend himself,” she said. “I hope she can come to terms with this and find peace.”

Mackenzie told Oprah that her family’s disbelief and anger saddened her, especially since she and Bijou Phillips have been very close. In fact, it was Bijou who immediately came to her aid when she was arrested last year for cocaine and heroin possession.

“I love my baby sister, and I miss having contact with her. By the time Bijou was living with my father, I felt she was safe. I did take her out of there if I felt like she wasn’t being watched properly,” she said in her defense.