- Married at age 70 to 28-year-old Patricia Mowbray, daughter of his long-time and very good performing and social associate Alan Mowbray.
- According to author Blackie Seymour in the February 2009 issue of "Classic Images", Dumbrille owned an onion farm at one point but sold it after making his Broadway debut in "Macbeth" in 1924.
- Son-in-law of Alan Mowbray.
- Appeared in six Oscar Best Picture nominees: I Am a Fugitive from a Chain Gang (1932), The Lives of a Bengal Lancer (1935), Naughty Marietta (1935), Mr. Deeds Goes to Town (1936), Julius Caesar (1953) and The Ten Commandments (1956).
- Sons with Jessie Lawson: John Lawson Dumbrille of Los Angeles and Douglass Murray Dumbrille of San Francisco.
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