Princess Diana was a vivacious child — even if her childhood was not always an easy one. “After my mother left, it was really the two of us growing up alone,” Diana’s brother Charles, 9th Earl Spencer, says in an exclusive sneak peek of The Story of Diana, an upcoming two-part television event from PEOPLE and ABC. Exclusive home movie footage shows young Diana at play, goofing with her little brother and captivating the camera from an early age.