Marriage and family
Carlos Hugo's engagement to Princess Irene of the Netherlands, daughter of Queen Juliana of the Netherlands, caused a constitutional crisis in the Netherlands for several reasons. Irene lost her rights of succession to the Dutch throne because the government refused to enact a law permitting the marriage. Her mother could not go to Madrid to talk Irene out of the marriage and of her conversion to Catholicism because the government advised her against it. The issue that prevented the government from making a law permitting the marriage was Carlos's claim to the Spanish throne. The Dutch government saw international political difficulties arising from a possible heir to the Dutch throne holding a controversial claim to the throne of a foreign state.
Carlos Hugo and Irene were married on 29 April 1964, in the Borghese Chapel at the Basilica di Santa Maria Maggiore in Rome, by Cardinal Paolo Giobbe, the former Apostolic Nuncio to the Netherlands. No other members of the Dutch royal family were present; Irene's parents watched the ceremony on television. After the ceremony, Carlos Hugo and Irene had a private audience with Pope Paul VI. They spent their honeymoon in Las Palmas de Gran Canaria, after which they settled in Madrid.
Carlos Hugo and Irene divorced on 26 May 1981. They had four children:
Prince Carlos Javier Bernardo Sixto María, Duke of Parma (27 January 1970). He has a natural son, Carlos Hugo (born 20 January 1997), with Brigitte Klynstra. On 12 June 2010, Prince Carlos married Annemarie Cecilia Gualthérie van Weezel. They have three children:
Princess Luisa of Bourbon-Parme (10 May 2012)
Princess Cecilia of Bourbon-Parme (17 October 2013)
Carlos Enrique Leonard, Hereditary Prince of Bourbon-Parma (24 April 2016)
Princess Margarita María Beatriz of Bourbon Parma (13 October 1972) she married Edwin de Roy van Zuydewijn on 22 September 2001 and they were divorced on 8 November 2006. She remarried Tjalling Siebe ten Cate on 2 May 2008. They have two daughters:
Julia ten Cate (3 September 2008)
Paola ten Cate (25 February 2011)
Prince Jaime Bernardo of Bourbon Parma (13 October 1972); he married Viktoria Cservenyak on 3 October 2013. They have two daughters:
Princess Zita Clara of Bourbon-Parma (21 February 2014)
Princess Gloria Irene of Bourbon-Parma (9 May 2016)
Princess María Carolina Cristina of Bourbon Parma (23 June 1974); she married Albert Alphons Ludgerus Brenninkmeijer on 21 April 2012. They have two children:
Alaïa-Maria Brenninkmeijer (20 May 2014)
Xavier Brenninkmeijer (16 December 2015)
In 2003, his daughter Margarita revealed that her father had an illegitimate son with a former nursery maid, called Javier, born in 1983.