Their twin daughters, Kilmeny and Deborah, have both forged successful careers as book illustrators.
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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).
Deborah Cox | Deborah Kerr | Deborah | Deborah Voigt | Deborah Brown | Niland brothers | Deborah Watling | Deborah Raffin | Deborah Willis | Deborah Butterfield | Deborah Todd | Deborah Read | Deborah Cavendish, Duchess of Devonshire | Deborah Allen | Deborah Sampson | Deborah Lipstadt | Deborah Doniach | Deborah Davis | Deborah Dash Moore | Deborah Willis (artist) | Deborah Tolman | Deborah Tannen | Deborah Niland | Deborah Moore | Deborah Meaden | Deborah Mash | Deborah King | Deborah Kennedy | Deborah Jeane Palfrey | Deborah Holland |