- Brother of actor Brian Aherne.
- Leading actor of silent films, subsequently character player. Of Irish ancestry. Often billed as 'Pat Aherne'.
- Brother-in-law of Billie Houston.
- He has appeared in two films that have been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: The Day the Earth Stood Still (1951) & The Court Jester (1955).
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