Simon Charles Dorante-Day claims that he was conceived by the royal couple when the new king was just 17.
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The 56-year-old told 7News: “We are both the black sheep of the royal family, I would say we have that bond.
“And I believe Harry would be receptive to my plight.
“He got f***ed over by his dad, he has a bone to pick with Charles. Just like I do.
“The first thing I’d do if I met them is I’d give them a big hug – I think they need one, to be honest.
The Australian also added that Meghan Markle would have a lot in common with his Indigenous wife, Elvianna.
Dorante-Day continued: “The chance for all of us to talk one-on-one would be very… enlightening.
“It’s sadly pathetic. Makes me angry from a general perspective – let alone that he could be my half-brother.
“When people say he looked very nervous and jumpy, I understand where Harry is coming from with that. I can tell that he’s worried about someone attacking Meghan and saying something that will force her to react.
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“My wife is the same, so I can relate.
“My advice for Harry is to let her go, to let Meghan say what she wants to say.
“People have been racist and insensitive to Meghan, she should give it back to critics without people looking down on her.
“He has a Black wife. They say there isn’t a race issue, but there is. People are so ignorant.”
Dorante-Day was born in Portsmouth on April 5, 1966, and was adopted when he was eight months old before his family later settled in Australia.
He claims his adoptive grandparents worked for the Queen and Prince Philip and that his adoptive grandmother told him he was the son of Charles and Camilla.
Dorante-Day has come into the media spotlight since Queen Elizabeth died as he believes that his children share a resemblance with his supposed grandmother.
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