Sisters Ashley, 30, and Megan, 24, say growing up they were sexually abused repeatedly by their step-grandfather, Joseph Palmer, and claim their grandmother, Peggy, knew about the abuse — but did nothing to stop it. In 2007, Palmer was convicted of 151 counts of sexual misconduct and sentenced to more than 250 years in prison. The sisters say they can’t move on until they get an apology from Peggy, who continues to adamantly deny that the abuse ever took place. Emotions run high on Dr. Phil’s stage when the sisters face their grandmother for the first time in seven years. Why does Peggy say her granddaughters are lying? This program contains strong sexual content. Viewer discretion advised.

More than 16 million kids in the United States are at risk for hunger each day. Fortunately, you can help. Visit Feeding America to find your local food bank. And, help Dr. Phil raise enough money for 10 million meals. Donate today!

Why do the sisters say they feel Peggy knew what was happening but did nothing to stop it?

“You wake up in the middle of the night, and your husband is on his knees, at the bed of a child, with his hand on her leg, and that doesn’t go, ‘Ding! Ding! Ding! Ding!’ with you?”

"If he was molesting her, why did she keep coming back?"

See what causes Peggy to storm offstage.

Don't miss Part 2 tomorrow! Will Ashley and Megan finally get the apology they are looking for?