Ryan told TV Guide Magazine the show hurt -- instead of helped -- his relationship with Tatum. He said the two are no longer speaking.
"We only reconciled on the show," he told the magazine. "Not in life. In fact, we're further apart now than we were when we started the show. So thanks, Oprah, for all your help."
The show on Oprah Winfrey's network, OWN, followed Tatum moving home to Los Angeles to reconcile with her estranged father, Ryan. In conjunction with the series, Tatum released a memoir, 'Found: A Daughter's Journey Home.'
After starring in several films together -- including 'Paper Moon' -- Ryan and Tatum were estranged for more than 25 years. In her 2004 autobiography 'A Paper Life,' Tatum alleged sexual abuse by a male friend of her father's and physical and emotional abuse from Ryan.
After battling drug addictions for years, Tatum wrote the alleged abuse from her father caused her to turn to drug use. At the time, Ryan released this statement: "It is a sad day when malicious lies are told in order to become a 'best-seller'."
In June 2011, Ryan went on 'Piers Morgan Tonight' and said Tatum and his family drama caused Farah Fawcett's cancer.
"There was turmoil during my love affair with Farrah, a lot of it caused by my family, by my kids, all of them, but particularly Tatum," he said. "And I just think if she had never met us, would she still be alive today? Because nobody knows what causes cancer, do they?"
Watch a clip from 'The O'Neals' season finale, which aired in August, below.