Princes William, Charles and Harry on a visit to Canada in 1998.(Chuck Stoody-The Canadian Press)

Canadians have watched Princes William, far left, and Prince Harry, far right, grow up in the public eye. Here in this 1998 file photo, the boys are with their father, Prince Charles on a visit Canada. They try on Roots jackets and hats from the Canadian Olympic Team Uniform in Vancouver.

Although only Charles and his wife Camilla will be on the visit to Canada this time, the young princes and ups and downs of their lives are never far from peoples' minds and photographers' eyes.