Their twin daughters, Kilmeny and Deborah, have both forged successful careers as book illustrators.
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She also completed his research into the life of Les Darcy, releasing it in the form of a biography, Home Before Dark (1995), that was written with her son-in-law Rafe Champion.
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Niland married fellow writer, Ruth Park (1917–2010), on 11 May 1942 and the couple had five children: Anne (born ca. June 1943), Rory, Patrick and twin daughters, Kilmeny (1950-2009) and Deborah (1950-present).
Brian d'Arcy James | Niland brothers | William Knox D'Arcy | Thomas D'Arcy McGee | Ray D'Arcy | The Ray D'Arcy Show | James D'Arcy | D'Arcy, British Columbia | Deborah Niland | D'arcy Wretzky | D'Arcy | Arcy-sur-Cure | Walter D'Arcy Hall | Tolleshunt D'Arcy | Thom D'arcy | Thomas D'Arcy McGee Building | Thomas D'Arcy | Nora Niland | John Niland | John Michael D'Arcy | John D'Arcy | Hugh Antoine d'Arcy | Frederick 'Fritz' Niland | Dashiell Eaves (right) as Joey with Brian d'Arcy James and Andrew Connolly in the original Broadway cast of The Lieutenant of Inishmore | D'Arcy McNickle | D'Arcy McGee | D'Arcy Argue Counsell Martin | Cecil D'Arcy | Brian D'Arcy James | Alexander D'Arcy |