"It was a great honor to play the role." Actor John Lithgow reflects on his Oscar-nominated 1982 performance as Roberta Muldoon in "The World According to Garp" and the conversation now — four decades later — about which actors should and shouldn’t play transgender characters. PBS | Firing Line with Margaret Hoover

Can you believe it? John Lithgow and Henry Louis Gates, Jr. are DNA cousins. Watch the full episode at PBS.org/FindingYourRoots. #FindingYourRoots | Finding Your Roots