His half-brother Sir Frank Gavan Duffy (1852–1936) was the fourth Chief Justice of the High Court of Australia, sitting on the bench of the High Court from 1913 to 1935.
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Gavan Duffy published articles and pamphlets urging recognition of Ireland as a sovereign nation at the Paris Peace Conference, which caused increasing embarrassment to the French establishment, who believed his publications were damaging Franco-British relations.
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