Desi Arnaz Jr. is opening up about his father, Desi Arnaz, and offering a rare look at a man who lived to entertain — but wrestled with his demons behind the scenes.

Desi Arnaz Jr. is opening up about his father, Desi Arnaz, and offering a rare look at a man who lived to entertain — but wrestled with his demons behind the scenes. In his new book Desi Arnaz ...

Desi Arnaz Jr. is sharing some rare insight into his famous parents' marriage. Desi Jr., 72, opens up to biographer Todd S. Purdum, author of the new book, ...

Lucie Arnaz, Lucille Ball, Gary Morton and Desi Arnaz Jr. in January 1961. CBS via Getty Images. Ball and Morton were still married when the actress died at age 77 in 1989.

Actors Desi Arnaz (1917 - 1986) and Lucille Ball (1911 - 1989) pose with their son Desi Arnaz Jr. at their home in California. KM Archive/Getty Images.

Lucille Ball and Desi Arnaz’s children, Desi Arnaz Jr. and Lucie Arnaz, are pulling back the curtain on their childhood — and revealing what it was like growing up on I Love Lucy.

Desi Arnaz played comic foil to his off-screen wife on 'I Love Lucy.' Behind the scenes, he revolutionized the TV business, as Todd Purdum outlines in his poignant biography.

Desi Jr. and Lucie Arnaz accept the Legacy of Laughter Award for their mother, the late Lucille Ball, in 2007. Getty Images A year later, Bardem told People that he could feel Arnaz’s spirit on set.

Desi Arnaz Jr. shared some rare insights into his childhood growing up with Lucille Ball and Desi Arnaz with biographer Todd S. Purdum for the new book titled Desi Arnaz: The Man Who Invented ...

Many people still think of Desi Arnaz as Lucille Ball's foil on “I Love Lucy,” but he was most definitely not only that guy. (Bettmann Archive/Getty Images) Review by Ty Burr Luuuucy — he ...