Only a few months after Édouard's marriage, his father died and he formally took over the running of
de Rothschild Frères bank. His grandfather and the French bank founder,
James Mayer de Rothschild, had stipulated "that the three branches of the family descended from him always be represented." As such, Édouard would be joined by the sons of two different uncles: cousin
Robert Philippe de Rothschild (1880–1946) and cousin
Maurice de Rothschild (1881–1957). Édouard was cautious by nature and often old-fashioned in his ideas, an attitude which extended to his personal dress and office décor. Like his father, Édouard too was appointed a director of the
Banque de France. In 1911, he negotiated a deal with
Henri Deterding for his
Royal Dutch Shell company to purchase the Rothschilds'
Azerbaijan oil fields. In 1937, the government of France nationalized the country's
railways including a major Rothschild railway asset owned in partnership with the English branch of the family. They had owned the
Chemin de Fer du Nord rail transport company for almost 100 years and had an interest in the
Chemins de fer de Paris à Lyon et à la Méditerranée railway which Robert represented for the family on its board of directors. Because of cousin Maurice's perceived flamboyant playboy image and his conduct in political and business activities, Édouard considered him to be something of a
black sheep. They tolerated each other for the sake of the business but by the middle of the 1930s their differences reached a point where Édouard and cousin Robert decided to force Maurice out of de Rothschild Frères bank. After extensive and bitter negotiations, a buyout was reached through an arbitrator. Édouard de Rothschild inherited a share of the
Château Lafite Rothschild vineyard in
Bordeaux plus he also came into a valuable
art collection from his father which he expanded through a number of important purchases. His large collection included pieces by prominent
sculptors such as
Jean-Louis Lemoyne and
paintings from
Vigée-Lebrun,
Rembrandt and
The Astronomer by
Vermeer, amongst others. ==Thoroughbred horse racing/Polo==