The offending came to light after police attended a domestic disturbance at the pair's home in 2013 and found an infant at the residence which they suspected was fathered by the defendant.
The pair were first convicted in 2012 after the birth of their first child.
The pair had troubled upbringings which featured sexual and physical abuse.
The daughter was born after the man entered into a sexual relationship with his foster mother when he was only 13 and she was 30.
He had little to do with his daughter during her upbringing, but a sexual relationship between them started shortly after they were reunited in 2010.
She was 16 at the time.
They were both sentenced to supervision for the first conviction in 2012 with the father also receiving a sentence of community work.
The latest offending came to light following a police investigation in 2013, a summary of facts said.
They pleaded guilty to the latest charge last year.