The couple had twin sons, Louis and Alphonse, on 28 May 2010 in New York City. Their father has conferred upon them the historic French titles of, respectively, Duke of Burgundy ("duc de Bourgogne"), and Duke of Berry ("duc de Berry") (In Spain, the twins are "Don" Luis and "Don" Alfonso de Borbón Vargas). Prince Louis, as Legitimist Dauphin of France, is expected to succeed his father as head of the French royal house, the senior Bourbon/Capetian line, in Legitimist reckoning. Louis and Alphonse were baptised on 5 September 2010 at St Peter's Basilica in Vatican City by Cardinal Angelo Comastri. Louis' godparents were Arancha Martínez-Bordíu (his father's maternal aunt) and Francisco D'Agostino (his mother's brother-in-law). Alphonse's godparents were Amparo Corell de Trenor, Baroness de Alacuás and Lorenzo Perales.