The late royal's former private secretary Patrick Jephson tells PEOPLE she still inspires her sons "along the difficult path they were born to follow"

Take it from Diana’s biographer, Andrew Morton, who collaborated with the Princess of Wales on the bombshell 1992 book Diana: Her True Story. Speaking to People for a new cover story, Morton told the outlet, “Diana always used to say she had two boys for a reason—the younger would be there to support the older in the lonely task as future king.”

Princess Diana always had one wish for her sons Prince William and Prince Harry, but it has fallen apart after their ongoing rift left her hopes in tatters