In 1912, James and his wife Isabelle delivered twins Ronald and Winifred at their residence, 9 Terry Street Temple (St Peters) in NSW.
Birth index of twins: 34918/1912 DUNCAN RONALD B (f)JAMES (m) ISABELLA A (reg)ST PETERS 34919/1912 DUNCAN WINIFRED M (f) JAMES (m)ISABELLA A (reg)ST PETERS
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