Allegra Shawnessy was the daughter of Wesley Shawnessy and his wife Alice. She married Frank Bloom Tincrowder, and had several children, including the science-fiction writer Leo Queequeg Tincrowder and Samantha Tincrowder, who married another science-fiction writer, Jonathan Swift Somers III.

Philip José Farmer discusses the Tincrowder families in Doc Savage: His Apocalyptic Life and Jonathan Swift Somers III: Cosmic Traveller in a Wheelchair".

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