Jessica, Amber and Brittney claim their former stepfather, Steve, abused them as children. They all claim Steve sexually abused them, and Brittney claims she was also a victim of physical abuse.

TELL DR. PHIL YOUR STORY: Have you been accused and want to cleary your name?

Steve adamantly denies the allegations. He claims his ex-wife Meloni, encouraged her daughters to make up lies about him. 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 still maintains his innocence.

Steve claims court papers show that his former stepdaughters changed their stories numerous times.

WATCH: Man Claims Ex-Wife Has Been Falsely Accusing Men Of Abuse For Years

In the video above, Dr. Phil reviews some of the statements the sisters made and notes possible inconsistencies. How do Brittney and Amber explain their stories?

On Tuesday's episode of Dr. Phil, Steve’s biological daughter claims she has a secret she’s been keeping for years. And, Steve, who agreed to take a polygraph exam, receives his results. What do they reveal? Check here to see where you can watch.

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Woman Confronts Father: ‘Yes Or No: Are You Calling Me A Liar?’