Mackenzie Phillips opens up about her 10-year incestuous affair with her own FATHER, Mamas & Papas frontman John, in rare interview with her sister Chynna - revealing how she FORGAVE him after he 'raped her' at age 19

Delving into the topic of their father, Chynna began with saying John was 'one of my favorite individuals in the whole wide world,' but admitted he had a side that was 'dark' and 'monster.'