File photo dated 06/09/95 of The Prince and Princess of Wales with their sons Prince Harry (centre left) and Prince William (centre right) as they arrived at Manor House for William's first day at Eton college. 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.