It's a fairy tale that pushes the boundaries of fidelity - a child born of a secret love affair between Prince Charles and Camilla Parker-Bowles as teenagers, could there be any truth in the Simon Charles Dorante-Day story?
The 55-year-old British-born engineer, who now lives in Queensland, claims his adoptive grandmother told him that the Duchess of Cornwall was his mother in 1998.
Having 'done his research', Simon is convinced that he now has enough evidence - along with cheeks and teeth like Windsor 'and' Camilla-style hair '- that his claims are true. He has said several times that he would like a DNA test to prove his family connection and wrote to the couple in 2012.
And this week, the father of nine shared a photo of his son to 'prove' they are related to the Royal Family, claiming the 14-year-old is a very similar image to Elizabeth II.
Dorante-Day insists he's not 'looking for a title' or money - even though he recently set up a new business called 'Royal Riffs' by selling handmade guitars 'with that royal finish' - and is' ??just a man looking for his biological parents.
Surprisingly, Charles and Camilla never responded to his claims.
Dorante-Day claims that, at the age of eight months, he was adopted by a local Portsmouth couple named Karen and David Day.
He says his adoptive grandparents, Winifred and Ernest Bowlden, had both worked for the late Queen and Duke of Edinburgh, as a cook and gardener in one of their royal families.
He claims that Ernest received an Imperial Service Award for his work for Her Majesty, and that his adoptive grandmother told him many times that Charles and Camilla were his real parents.
Dorante-Day claims Camilla used protection officers and royal family ties to help her keep it a secret.
He claims in the months before he was born, Camilla disappeared from the social scene for at least nine months while Charles was sent to Australia.
