Wendy Ryan posted an image online reportedly of her father Ian Bullock conversing with the Prince of Wales at Brisbane City Botanic Gardens on Wednesday.
Prince Charles: "Oh, don't believe all that crap".
"Old school pals catching up from #timbertop", Ms Ryan wrote on Instagram.
As they clutched a photo of them with the prince, taken on the day they were last together, the sisters were given a warm reception by the now 69-year-old prince.
According to the Courier Mail Mr Bullock attended the school for three years, including the two terms the Prince was at the school, but the pair did not have much to do with one another during the time. "I look forward to seeing him again", Turnbull added.
Prince Charles then continued on so the reporter then proceeded to ask the Duchess of Cornwall the same question.
Prince Charles and his wife Camilla, Duchess of Cornwall are now on a seven day tour of Australia together, and he gave a radio interview where he answered a question about a insane rumor.
In a speech that was addressed to the entire Commonwealth, Prince Charles told the crowd that the "friendly games" have shown the potential of the Commonwealth to connect people of different backgrounds and nationalities.
Prince Charles and Camilla's visit to Australia came just days after a poll revealed that the residents wanted to end the monarchy in their country.
Both tried their hands at table tennis, with Camilla joking that she would "leave it to the professionals".
Express claims the duchess will travel home on a commercial flight to London, while Prince Charles is scheduled to travel to North Queensland and the Northern Territory, finishing the tour in Vanuatu on April 10th.