Louis Alphonse, Duke of Anjou
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. However, under Spanish law, and assuming Felipe VI does not in future father a son, the Spanish crown will be inherited by his elder daughter Leonor, Princess of Asturias, who will become queen regnant, and if Felipe does have a son, that son will inherit the Spanish throne regardless of the genealogical seniority of the Anjou branch. Louis and Alphonse were baptised on 5 September 2010 at St Peter's Basilica in Vatican City. Louis' godparents were Arancha Martínez-Bordíu and Francisco D'Agostino and Alphonse's were Amparo Corell de Trenor, and Lorenzo Perales.
Rothschild banking family of France
The Rothschild banking family of France is a French banking dynasty founded in 1812 in Paris by James Mayer de Rothschild (1792–1868). James was sent there from his home in Frankfurt, Germany, by his father, Mayer Amschel Rothschild (1744–1812). Wanting his sons to succeed on their own and to expand the family business across Europe, Mayer Amschel Rothschild had his eldest son remain in Frankfurt, while his four other sons were sent to different European cities to establish a financial institution to invest in business and provide banking services. Endogamy within the family was an essential part of the Rothschild strategy in order to ensure control of their wealth remained in family hands.