There is a story that Edward V111, when Prince of Wales visited
Australia and had a sexual relationship with a girl by the name of
Mollee or Mildred Little from Sydney.Shortly after the Prince left
Australia Miss little married a Roy Chisholm had a baby whom she
called David Anthony Chisholm. David grew up known as Tony and latter
she gave birth to Bruce Chisholm. I can not find any record of a
David/Tony Chisholm/Little birth (around 1920/21). How do I start ?
If you think you can help further than just an answer to the question
please let me know.

As a matter of interest, Edward VIII was believed to be infertile as a
consequence of contracting mumps as a young adult.

There was a joke around in the 1930's that he was not 'heir
conditioned'.

Although I don't know how much of this information will be conducive
to what you need, this may provide helpful.

First of all, I briefly found a deleted web record pertaining to the
death of a David Anthony Chisholm in the Sydney Morning Herald, as of
a publication date of the 10th of June, 1989.  If possible to obtain
archives of this paper, I strongly recommend it as it may contain data
on this person's life, and I find it likely and possible being where
this paper is based and the possible age of David Anthony that this is
in fact, one of the two people you are looking for.

I'm still looking through various geneologies to see if I can be of
assistance.