His aunt (click here to see a portrait of her by Fedrico de Madrazo y Kuntz, now in the Musée Bonnat, Bayonne) Adeline (1825–1892) was wife to Baron de Weissweiller of Madrid. Another was married to a Duke de Laurito (d.1907). His Cohen great-aunts, who were also his cousins, had married Nathan Mayer Rothschild and Moses Montefiore. A great-uncle Samuel Helbert Israel Ellis was a surgeon at the London Hospital c.1802 and treasurer of the Great Synagogue, Duke's Place, London. Samuel's son was Sir Barrow Helbert Ellis, K.C.S.I., HEICS (1823–1887).