His younger sister, Naomi Mitchison, became a writer while his uncle was Richard Haldane, 1st Viscount Haldane and his aunt the author Elizabeth Haldane.
His younger sister became a writer. His uncle was Richard Haldane. His uncle was 1st Viscount Haldane. His uncle was his aunt the author Elizabeth Haldane. Naomi Mitchison was his younger sister.