John Deaves married his third wife Dorothy back in 1984, but caused a public outcry in 2008 when it was revealed he had been having an incestuous affair with his biological daughter, Jenny.
The relationship started in 2000 after Jenny, who was 31 and married with children, had gone to stay with Dorothy and her then 53-year-old father in Port Pirie, South Australia.
Jenny had been estranged from John, only seeing him three times before 2000.
Once the pair had reunited, their relationship quickly evolved into a forbidden affair.
Dorothy has since revealed the sickening confession John made to her about his relationship with his daughter.
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Dorothy told Australian Associated Press: "When they got back here he informed me it was the best sex he ever had.
"If that doesn't degrade you I don't know what does. It was my second marriage, and you feel like... you get a very poor opinion of yourself."
The incestuous love affair was to be the end of Dorothy and John's 12 years of marriage.
John and Jenny went on to have two children together. The first died shortly after being born.
The couple separated in 2008 after a court ruled they had broken the law.
However, they reportedly continued to see each other until the relationship ended in 2009.
Before their split, the father and daughter pair boasted on 60 Minutes Australia of their "absolutely fantastic" sex life.
John even tried to say that they were a "normal" boyfriend and girlfriend.
He said: "Emotions take over, as people no doubt realise, there are times during your life where emotions do rule the heart, it rules the head.
“I knew it was illegal, of course I knew it was illegal but you know, so what.”
Jenny also said that sex with her dad was like "a sexual relationship with any other man," claiming the relationship was "not harming anyone else."
Dorothy and Jenny's mum, Joan, had tried to break up the relationship, even attempting to involve the police.
Dorothy told Channel Nine: “We tried to split them up, her mum (Joan) and I did. We tried bringing the law onto them, but they escaped.”
The relationship eventually resulted in a court case.
Both John and Jenny pleaded guilty to two counts of incest.
The first related to the intercourse which led to the birth of their first child who died in 2001. The second related to the birth of their healthy daughter in 2007.
