Kyle and Jackie O spoke with Nick last year, when he realised the woman he was in a serious relationship with was in fact his half-sister.

But this isn’t the first time the breakfast show had heard from *Nick about his incest relationship.

About a year ago, he made contact with the pair admitting that the woman he was in a “serious relationship” with was in fact his half-sister.

In 2016, Nick explained to Kyle and Jackie O that both he and his half-sister were each raised by a different single mother.

After dating for approximately eight months, the pair realised they had the same father on a closer examination of their birth certificates.

This morning, the KIIS FM duo revisited Nick to see what had come of his relationship with his half-sister.

The man revealed that he and his partner had recently welcomed a biological son.

“He’s a beautiful little boy, there’s nothing wrong with him,“ Nick said.

Admitting that he and his partner did have concerns over any health implications, Nick said his son was born without any deformities, and that only one doctor and one friend knew he and his partner were blood related.

“He [their doctor] said you have to be careful and that there’s a high chance of there being birth defects,” Nick explained.

“But we took the risk and the gamble, and at the moment everything seems to be fine. It doesn’t mean that later on down the track there might be issues.”

Kyle Sandilands was left in shock after hearing about listener 'Nick' who had a child with his half-sister.Source:YouTube

Incest is a crime in every Australian jurisdiction, but definitions and penalties vary from state to state.

When questioned by Henderson of the kinds of deformities an incest baby may be exposed to, Nick explained that he and his partner didn’t want to “get into it” with the doctors.

“We didn’t want to know anything that could happen or would happen,” he said.

“So far, so good.”

Nick said that his father — who is also his partner’s dad — wasn’t aware of their relationship, or that he is now a grandfather.

It is understood that Nick and his partner don’t plan on telling their son about being related.

When quizzed by Sandilands of their sex life, Nick explained that sometimes they have their “weird moments”.

“We have our weird moments where one of us has taken it too far when joking about it in the bedroom,” he explained.

“There may be a weird moment when one of us will take it too far. Like in the bedroom, saying: ‘Oh you can’t do that to me, you’re my brother,’ or something.”

Nick hopes to buy a place with his partner and son, and to live a relatively normal life as a family.