- Gabrielle and her brother Christopher Toyne represent the fourth generation of an established English "showbiz" family. Their father was the respected actor-manager and dueling expert Gabriel Toyne; their mother the leading actress-comedienne Diana Beaumont; their grandfather the 'rebel' Fleet Street editor-in-chief Comyns Beaumont and their great-uncle the theatre impresario-actor Sir Gerald du Maurier, father of the renowned author Daphne Du Maurier and son of the Victorian author/playwright/illustrator George L. Du Maurier. Gerald's sister, Sylvia, and her four children, were befriended by Sir J.M. Barrie and depicted in the film Finding Neverland (2004) - showing the creation of Peter Pan.
- Stepmother of cinematographer Ben Davis and step-grandmother of actors Roman Griffin Davis, Gilby Griffin Davis, and Hardy Griffin Davis.
- She took her mother's maiden name, Beaumont, when she left school.
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