Young Prince At Military Spectacle :Sees mother take salute for the King at Trooping The Colour : Prince Charles driving with his aunt, Princess Margaret, and his grandmother, Queen Elizabeth, to the ceremony.Today was a great day for 2 1/2 -year-old Prince Charles, son of Princes Elizabeth and the Duke of Edinburgh. With his aunt, Princess Margaret, and his grandmother, Queen Elizabeth, he drove in an open carriage to attend for the first time the Trooping the Colour on Horse Guards Parade, London, in honour of the official birthday of his grandfather, King George VI. He watched his mother, deputising for the King, who is ill, take the salute at the great military spectacle. June 7, 1951. (Photo by Paul Popper).