( CM ) - JANET JACKSON has attacked her father JOE for cheating on her mother and having affairs when she was young. The Nasty singer admits she still has no idea how her mother Katherine put up with her husband's infidelities - and she'll never forgive her dad for having an illegitimate child with a Jackson 5 fan. In a fierce new Parade magazine interview, the normally coy pop superstar rages about her love rat father and pays tribute to her mother's strength. She says, "It's a very cold world, and to have gone through what she has had to experience, from having polio as a child to those things with my brother Michael, and then for my father to have had another child. "I've been cheated on a lot. I know what that feels like and how that hurts the heart. But, I mean, to give us a half-sister, I can't even fathom what that's like for mother. "For her to stay with my father all these years and never abandon her kids, that's true love."