 Bonham Carter is a distant cousin of actor Crispin Bonham-Carter.Other prominent distant relatives include Lothian Bonham Carter, who played first-class cricket for Hampshire, his son, Vice Admiral Sir Stuart Bonham Carter, who served in the Royal Navy in both world wars, and pioneering English nurse Florence Nightingale.Her maternal grandfather, Spanish diplomat Eduardo Propper de Callejón, saved thousands of Jews from the Holocaust during the Second World War, for which he was recognised as Righteous Among the Nations, and posthumously received the Courage to Care Award from the Anti-Defamation League.