Jaime's grandfather,
Infante Don Carlos of Spain, Duke of Calabria, had to consider whether the future marriage of
Prince Pedro to Sofía Landaluce y Melgarejo would meet the conditions established in the Sovereign Act that was signed in Naples on 7 April 1829, Law no. 2362, which gave the "head of Our House of Bourbon... such authority as is necessary to protect the purity and splendour of the throne", by requiring all members of the dynasty to have formal permission to marry. This was confirmed in the Sovereign Act signed at Naples on 12 March 1836, Law no. 3331. The marriages of all members of the dynasty that had been considered capable of transmitting dynastic rights had been to royal princesses until the marriage of
Prince Ranieri to Countess Carolina Zamoyska in 1929. The ultimate decision of Infante Carlos to permit his son's marriage to be considered dynastic followed the marriages of the daughters of
King Juan Carlos without them being required to renounce their right of succession to the Spanish throne, and a change in the marriage rules of the House of Austria. Infante Carlos and his wife attended the marriage of Prince Pedro on 30 March 2001, and the marriage is treated as a dynastic marriage transmitting full rights of succession to all the children of Prince Pedro and his wife. It was made clear by the date of the marriage of the future
King Felipe VI in 2004 that the children of Prince Pedro and his wife had full dynastic rights, and the children bear the style of Royal Highness and the title of Prince(ss) of Bourbon-Two Sicilies. == Marriage and issue ==