Delmar Watson, one of eight siblings who appeared in more than 1,000 films as children in the 1920s, '30s and '40s, died Sunday of prostate cancer at age 82. He often was cast in films with one or more of his brothers. Delmar appeared with his brother Billy, for example, in Frank Capra's Mr. Smith Goes to Washington in 1939. Like all five of his brothers, Watson became a news photographer after his career as a child actor ended, working first for newspapers, then as a newsreel and TV news cameraman.