File photo dated 17/06/10 of Prince William (right) and Prince Harry (left) visiting a children's orphanage in the mountains near Semongkong, Lesotho. The anniversary, this year, of Diana, Princess of Wales's death follows a turbulent time for her sons the Duke of Cambridge and the Duke of Sussex. The princess was killed suddenly in a car crash 23 years ago on August 31 1997 when William and Harry were only 15 and 12.