It may not have been Mother's Day when the latest episode of 'The Judds' (Sun., 9PM ET on OWN) was filmed, but it couldn't have aired on a more appropriate day. In it, Wynonna Judd brought her mother, Naomi, up on stage during a performance and had her sit nearby on a stool.

"You have been the joy and the intense challenge of my life. To have had this journey with you for 25 years, this is pretty unbelievable," Wynonna said of their lucrative career as a country music duo.

Wynonna then broke into a new song that she'd written to honor her mother. Naomi could do little more than sit there and beam, occasionally reaching over to grasp her daughter's hand.

"My greatest blessing on this earth and this journey has been with you," Wynonna told her.

While gathering some old family photos to be used in a concert video, Naomi Judd sees a heart-wrenching reminder of a terrible secret she's kept hidden until now.

"My first memory is when I was three and a half, and a man was trying to sexually abuse me," says Naomi on 'The Judds' (Sun., 9PM ET on OWN). "I rebuffed him. It happened twice more. I've never said anything to anybody."

As she and daughter Wynonna peruse the photographs, Naomi finds one from when she was four years old. "In this picture I'm actually standing next to this man."

Country music singers Wynonna and Naomi Judd were the guests on the latest 'Oprah Winfrey Show' (weekdays, syndicated). Mother Naomi and sisters Wynonna and Ashley Judd have been on 'Oprah' a startling eighteen times, dating back to their first appearance in 1990. But on their latest appearance, there was a little tension between Wynonna and Ashley -- even though Ashley wasn't actually in the studio.

Why wasn't Ashley there? Because she's currently in the Congo, on a humanitarian mission to work against violence towards women. Mom Naomi gushed about this. "I'm so proud of my daughter," she said. But Wynonna seemed less excited: "She's got time [to go to the Congo]; she don't have kids." Okay then.