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[on his heritage and religion, in a 2012 Haaretz interview] My father is Jewish, my mother is not, but I consider myself entirely Jewish even though according to Jewish law I am not. I encourage everyone to understand that the rules [of Jewish matrilineal descent] were written before anyone could do DNA tests... I know that I am a descendant of Abraham through my father... I definitely plan to [...
His father, Robert S. Miller, worked for Hyperion Books, and is a publisher at Workman Publishing. His mother, Marta (Koch), is a modern dancer. Ezra's father is of Ashkenazi Jewish descent and Ezra's mother is of German and Dutch descent. Ezra's father's step-brother is a rabbi, and Ezra's father's step-nephew is writer Gideon Lewis-Kraus.