- One of the 36 founders of the Academy of Motion Picture Arts and Sciences (AMPAS)
- His principal heir was his nephew, Frederick (Fritz) Sills, who went on to become a world-famous bodybuilder. Fritz was lured to Hollywood in the 1960s when he was offered the starring role in Tarzan. He turned down the role when he learned that the salary was $1,750 a week, less than he was receiving from his uncle's trust fund. Fritz Sills died in Hollywood in 1968.
- Before becoming an actor, he was a professor of philosophy at the University of Chicago (IL).
- Daughter Dorothy Sills.
- Son Kenyon Clarence Sills (6 May 1927 - 11 April 1971)
- Fluent in Italian, Russian, French, and German
- Father: William Henry Sills; Mother: Josephine Antoinette Troost.
- Sills was a member of the Delta Kappa Epsilon fraternity.
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