Chynna Phillips Steps in to Defend Half-Sister Mackenzie

People are still in shock over Mackenzie Phillips' recent confession about her consensual relationship between herself and her musician father John Phillips. While appearing on "Oprah" Wednesday, Mackenzie talked about her drug-induced, sexual relationship, which she details, in her new book, "High On Arrival." It has created a frenzy among viewers and she will reappear on the show via satellite Friday to discuss her family's reaction. The reaction has been mixed, with some family members in disbelief and unsupportive while others like half-sister Chynna Phillips showing warmth and understanding.

It is common for families of incest to deny allegations of a loved one. Chynna, however, confirms that such a relationship existed between Mackenzie and John, and claims she had known about it for 12 years. Stepmother Michelle Phillips claims the allegations are untrue, while younger sister Bijou Phillips questions the accuracy of such a relationship based on such heavy drug use.