 During 1904 Cameron and other leading London financiers – including Lord Revelstoke of Baring Bros., Arthur Francis Levita and W. M. Koch of Panmure Gordon (Levita's daughter Enid would later marry Cameron's grandson Ewen Donald Cameron in 1930), Sir Marcus Samuel (later Viscount Bearsted) of Samuel Samuel & Co and Royal Dutch Shell, Sir Carl Meyer, and Otto Kahn – took part in negotiations with the Japanese central banker Takahashi Korekiyo (later Prime Minister of Japan) for the selling of war bonds to finance the Japanese war effort during the Russo-Japanese War.In 1878, Cameron married Josephine Elizabeth (born at Shotford, Norfolk in 1857), daughter of John Houchen of Thetford, Norfolk (Wereham, Norfolk, c. 1818 – Thetford, Norfolk, 6 October 1898) by his wife (m. St James's, Westminster, 29 November 1845) Susannah Vautier (Stanton, Suffolk, c. 1819 – Thetford, Norfolk, 1859), by whom he had five children.His eldest son, Ewen Allan Cameron, senior partner in Panmure Gordon & Co. and member of the Council of Foreign Bondholders (who died 14 November 1937 in Vienna) was the great-grandfather of David Cameron, Conservative Party Leader (2005–2016) and British Prime Minister (2010–2016).