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His siblings are actor Ralph Fiennes; directors Martha Fiennes and Sophie Fiennes; composer Magnus Fiennes; and conservationist Jacob Fiennes, Joseph's twin brother. His foster brother, Michael Emery, is an archaeologist. His nephew Hero Fiennes-Tiffin played Tom Riddle, young Lord Voldemort in "Harry Potter and the Half-Blood Prince". His cousin is Sir Ranulph (Ran) Fiennes, a decorated English explorer.