John Wayne was furious when caught using an oxygen mask on the set of The Sons of Katie Elder, but his co-star Dean Martin ...

In fact, this is where both John and Patrick Wayne share an on-screen first. Who plays Wayne's kidnapped grandson? Well, it's none other than the Duke's real-life youngest son, John Ethan Wayne.

However, his son Ethan Wayne re-opened it later on, and got inspired to create a bourbon brand in honor of his father. Duke Spirits is founded on John Wayne's dream of starting his own line of ...