María Del Rosario Cayetana Fitz-James Stuart Y Silva

• Jacobo Martínez de Irujo y Fitz-James Stuart, 23rd Count of Siruela, born 15 July 1954 in Madrid. On 1 November 1980, he married María Eugenia Fernández de Castro y Fernández-Shaw (born 15 October 1954) but they later divorced. He married journalist, editor and writer Inka Martí Kiemann in April 2004.
- Jacobo Martínez de Irujo y Fernández de Castro (born 23 January 1981). He married Asela Perez Becerril on May 14, 2011. Co-owners of an art gallery.
- Brianda Eugenia Martínez de Irujo y Fernández de Castro (born 11 April 1984)
• Fernando Martínez de Irujo, 11th Marquis of San Vicente del Barco, born 11 July 1959. According to a profile of the Duchess of Alba published in 2008 in The Independent, the biological father of Fernando "is widely reported to be Sevillian flamenco dancer Antonio, el bailarin (Antonio Ruiz Soler, 1921-1996)", which, the paper previously stated, was "a rumour the Alba family never denied". Antonio, el bailarin declared this parentage in his posthumously published memoirs, though the publication of that information in the Spanish magazine Interviú led a Spanish court to award the duchess 90,000 euros, calling it an assault on the aristocrat's honor "with ... intention to profit".