The Brothers Warner is the companion documentary to Cass Warner Sperling’s book and the film examines the Warner Brothers family and the studio’s legacy. If there’s someone who can tell the Warner story, it’s Cass Warner Sperling. The fact that she’s Harry Warner’s grandaughter doesn’t hurt. This relationship helps to lend the film more of the personal story it needs. We get Cass’ personal stories about not only Harry but growing up within this famous…"The Brothers Warner: A Warner Bros. Documentary"