Princess Diana's tragic death 25 years ago left her bereft then-teenage sons Prince William and Prince Harry grief-stricken.
And nobody can forget the heartbreaking image of them united in grief as they walked behind her coffin at her funeral. Her shocking and untimely death at the age of 36 meant she never went on to see her sons grow into young men and marry their wives. And nor would she meet her five grandchildren - Prince George, Princess Charlotte, Prince Louis, Archie and Lilibet. But both William and Harry seem determined to ensure their children - Diana's grandchildren - know all about their late grandmother.