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Radcliffe was born in West London, England. He is the only child of Alan George Radcliffe, a literary agent, and Marcia Jeannine Gresham (née Marcia Gresham Jacobson).
His father is from "a very working-class" Protestant background in Banbridge, County Down, Northern Ireland. His mother is Jewish; she was born in South Africa and raised in Westcliff-on-Sea, Essex. Her family had originally come from Poland and Russia.
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