A Greek Australian father and daughter were so determined to win the cash prize on ‘Boyfriend or Daddy’ Melbourne radio show, they didn’t stop even at a making-out challenge.

Radio hosts Kyle Sandilands and Jackie O’ Henderson, who were suspicious the duo – Stacey, 26, and Nick, 49 – were in fact family, started asking uncomfortable details about their sex life in an effort to call them out.

Instead of stopping, the father and daughter kept delving into very non-appropriate details about their supposed sex life as a couple.

In a last attempt to prove they weren’t related O’ Henderson asked the couple if they would be comfortable sharing a kiss.

The ‘couple’ not only shared a quick kiss but went as far as to share a passionate make out session.

Stacey told the hosts, “I have a thing for older guys”, adding “My dad told me to go find a nice Greek boy, ‘cause I’m a little bit Greek, so I did.”

“They weren’t too impressed at the beginning, but he’s come around. They seem to go fishing and stuff together now,” she said while pretending that her Greek father and Greek boyfriend are not the same person.

The duo then officially won $1,000 for convincing the hosts they were a couple.

“The things we do for money – this is actually my father!” the woman revealed moments later, leaving the radio hosts shocked.

“My boyfriend’s going to be mortified,” she added.

The video was posted on the show’s account on Instagram.