The Kennedy family is mourning the loss of Christopher Lawford. Lawford's rep confirmed the sad news of his death to ET on Wednesday. Aside from being known for his famous family -- Lawford was the son of the late John F. Kennedy's sister, Patricia Kennedy, and actor Peter Lawford -- Lawford had acting roles on multiple hit TV shows including Frasier, General Hospital and All My Children. His movie roles included Terminator 3: Rise of the Machines and Thirteen Days, which interestingly enough, featured his famous uncles, John and Robert Kennedy, as characters. Lawford was 63 years old. According to...