Kermit's younger brother was Ken Maynard, a hugely popular western star from the early 1920s through the 1930s.

Terhune performed in 21 episodes of a popular Republic Studios western series called The Three Mesquiteers.

His former vaudeville act included juggling, bird calls and barnyard animal impressions, talents also incorporated into his sidekick roles.

(Source: Audio interview: Max Terhune 1971) He appeared frequently on weekends in the 1950s at Corriganville, a popular western film location developed by his co-star and friend who purchased the land in the late 1930s.

Terhune married Maude Cassady and they had three children: Donald Roltaire, Robert, and Maxine.

His son Robert was a stuntman who doubled burly actors like George Kennedy in films.