- Brother of librettist/lyricist Robert B. Smith.
- Uncle of actress Irene Bentley. Wife, Alexina Bentley, appeared on the New York stage in the early 1900s as Irene Bentley. She died 3 June 1940.
- Charter member of the American Society of Composers, Authors, and Publishers (ASCAP); on the board of directors, 1914.1917.
- Inducted into the Songwriters Hall of Fame in 1970.
- Son (with Lena Reed): Sydney Reed Smith (born July 15, 1892).
- Wife Alexina Bentley, aka Irene Bentley, actress.
- Father: Josiah Bailey Smith; Mother: Elizabeth Bach.
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