All three are ardent royalists and are really happy that Prince Charles will be Australia's King one day, and that they have had the chance to meet him.
Prince Charles is due to officially open the Commonwealth Games on behalf of his mother, Queen Elizabeth, on Wednesday night.
The waiting crowd yelled "welcome" as Charles and Camilla were greeted by Governor-General Peter Cosgrove and Home Affairs Minister Peter Dutton, representing the prime minister.
Their first stop has been Old Government House at the Botanic Gardens for the formal welcome to Australia.
Prince Charles stopped to speak to Vanessa Cull from Runcorn, asking about the Girl Guides, asking whether it was hard to find leaders these days.
Charles and Camilla wandered among hundreds of well-wishers who had risked rain to see them before visiting a Brisbane children's hospital.
"I just said that it's been rather hot lately", Mr Joyce said. The royal will complete his visit to far north Queensland by watching the Commonwealth Games women's basketball competition.
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Annabel's father, Brad Lauder, said her English grandfather Robert Marshall had also met Prince Charles, when he was working at a magistrates court in England.
Downer, who is due to step down as Australia's high commissioner in London at the end of April, told the BBC "I know Prince Charles and I would be nearly 100 per cent certain he had never said anything like that to Paul Keating".
In an opinion piece in The Sunday Times of London, Mr Keating wrote: "I have no doubt he believes Australia should be free of the British monarchy and that it should make its own way in the world".
"Frankly, I wish them all the best and the only thing I say to them is make sure you buy tickets and come to the Games when you're finished".
Malcolm Turnbull, who supports an Australian republic, said he is looking forward to meeting with the prince, who he told ABC Radio is a thoughtful, charming and knowledgeable man.
"The prince and I, and Lucy (Turnbull) share a lot of common interests, particularly in terms of urbanism, architecture, planning, environment and ecology". Prince Charles will also travel to Cairns to visit the HMAS Cairns where he will present the Gloucester Cup to the company of HMAS Leeuwin in recognition of their achievement of providing the highest level of overall proficiency.