- Brother of actresses Sybil Thorndike and Eileen Thorndike.
- Was sister Sybil's biographer in 1950.
- A cousin of actress Brenda Dunrich, whose mother was a Thorndike.
- Along with John Laurie and Esmond Knight, he is one of only three actors other than Laurence Olivier himself to appear in all three Shakespearean films that Olivier directed: Henry V (1944), Hamlet (1948) and Richard III (1955).
- Both he and his sister Sybil Thorndike appeared in films starring and directed by Laurence Olivier: he appeared in Henry V (1944), Hamlet (1948) and Richard III (1955) while his sister appeared in The Prince and the Showgirl (1957).
- He played the husband of his real life sister Sybil Thorndike in Macbeth (1922).
- Father of Daniel Thorndike. It is possible that Rosina Thorndike is also one of his children as she has the same given name is his wife's mother.
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