Jessica, Amber and Brittney claim they were sexually abused by their stepfather, Steve, when they were growing up.

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“I had a fear of him trying to kill us after this because of something he said to me when I was 17,” Brittney says. “He told me that he was going to kidnap my sisters, these two, my mother, and that he was going to record them saying that my mom made them say those things, kill them, save my mother for last, torture her slowly, and have her also admit that she made them say these things, kill her and then kill himself.”

“He told me he knew where to hide bodies,” Amber claims.

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After taking a plea which did not require him to admit wrongdoing, Steve was convicted of sexual abuse and had to register as a sex offender. But he maintains his innocence and says Jessica and Amber were brainwashed by their mother into lying. Steve also denies telling the women he was going to kill them but admits that he was in a "dark place" at that time in his life.

On Monday's episode of Dr. Phil, the sisters face off with Steve for the first time in 10 years. And, Steve agrees to take a polygraph exam. On Tuesday, see what his results reveal. Check here to see where you can watch.

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Woman Who Claims She Was Abused By Stepdad: ‘Steve Would Say ‘Let’s Tingle Each Other’’