DALLAS (AP) — Robert F. Kennedy Jr. is convinced that a lone gunman wasn't solely responsible for the assassination of his uncle, President John F. Kennedy, and said his father believed the Warren Commission report was a "shoddy piece of craftsmanship."

Kennedy and his sister, Rory, spoke about their family Friday night while being interviewed in front of an audience by Charlie Rose at the Winspear Opera House in Dallas. The event comes as a year of observances begins for the 50th anniversary of the president's death.

Their uncle was killed on Nov. 22, 1963, while riding in a motorcade through Dallas. Five years later, their father was assassinated in a Los Angeles hotel while celebrating his win in the California Democratic presidential primary.