Antoniutti was born in Nimis, the sixth of the seven children of Giuseppe and Anna (née Comelli) Antoniutti.
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During his time in Ottawa, he described Maclean's editor Blair Fraser, the father of Graham Fraser, as "badly informed" after he accused conservative clergy of keeping the Church in Canada too old-fashioned in its social principles in an article that the Apostolic Delegate called "evidently tendentious".