Ralph Morgan was married to Georgiana Louise Iverson, who as a stage actress was known as Grace Arnold, although he called her "Daisy" and was the father of Claudia Morgan (1911–1974), an actress best known for creating the role of Vera Claythorne on Broadway in the original production of Ten Little Indians, and for her portrayal of Nora Charles on the radio series The Thin Man.
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In a possibly apocryphal story by fellow panelist Oscar Levant, her appearances on the show stopped abruptly after she answered a question by referring to Agatha Christie's book Ten Little Niggers, which was the original British title of the book Ten Little Indians (later retitled And Then There Were None).