Posted Sep 25th 2009 5:00PM by TMZ Staff
Mackenzie Phillips' half-sister claims their father never made sexual advances towards her -- even though Mack supposedly had an incestuous 10-year relationship with the guy.

Chynna defended her sister today on Oprah -- where she said she absolutely believes the "hideous" allegations Mackenzie made about their dad, Mamas and the Papas singer John Phillips.
Filed under: Oprah
Tags: chynna phillips, ChynnaPhillips, incest, john phillips, JohnPhillips, mackenzie phillips, MackenziePhillips, mamas and the papas, MamasAndThePapas, oprah winfrey, OprahWinfrey
Posted Sep 23rd 2009 4:45PM by TMZ Staff
Mackenzie Phillips went public with an incestuous relationship with her father today on "Oprah" -- and says the reason the affair finally ended was because she became pregnant ... and didn't know if her father was the father.

Phillips claims she was raped by her dad, Mamas & the Papas singer John Phillips, while she was 19 -- and the relationship continued for 10 years. The "One Day at a Time" actress says she later became pregnant -- but wasn't sure if John or her then-husband Shane Fontayne was the baby-daddy.
According to Phillips, her father paid for the abortion -- and then she "never let him touch me again."
Filed under: Oprah
Tags: john phillips, JohnPhillips, mackenzie phillips, MackenziePhillips, mamas and the papas, MamasAndThePapas, oprah winfrey, OprahWinfrey