Prince William used to be 15 and Prince Harry staunch 12 when their mother used to be killed in a vehicle accident in France. Now the brothers are opening up about their largest remorse: their final phone name with Princess Diana. Within the HBO documentary film, “Diana, Our Mom: Her Existence and Legacy,” the princes endure in thoughts their mom as a prankster. They were vacationing in Scotland when she died and, within the movie, they retract their final phone dialog along with her. #InsideEdition