Title: Teresa Cristina of the Two Sicilies
Content:  Teresa Cristina was the daughter of the then-Duke of Calabria, who later became King Don Francesco I (Francis I) of the Two Sicilies. Through her father, she was a member of the House of Bourbon-Two Sicilies, also known as Bourbon-Naples, the Italian branch of the Spanish Bourbons. She was a descendant of France's "Sun King", Louis XIV in the male line through his grandson, Don Felipe V (Philip V) of Spain. Teresa Cristina's mother was the Infanta Doña Maria Isabel (Maria Isabella), daughter of King Don Carlos IV (Charles IV) of Spain, and a younger sister of Doña Carlota Joaquina—who was the wife of King 
Title: Princess Maria Cristina of Bourbon-Two Sicilies
Content:  Maria Cristina was the daughter of Prince Alfonso of Bourbon-Two Sicilies, Count of Caserta and his wife Princess Maria Antonietta of Bourbon-Two Sicilies.
Title: Princess Maria Immaculata of Bourbon-Two Sicilies (1874–1947)
Content:  Princess Maria Immaculata Cristina Pia Isabella of Bourbon-Two Sicilies (Full Italian name: Maria Immacolata Speranza Pia Teresa Cristina Filomena Lucia Anna Isabella Cecilia Apollonia Barbara Agnese Zenobia, Principessa di Borbone delle Due Sicilie, ) (30 October 1874 &ndash; 28 November 1947) was the fourth child and eldest daughter of Prince Alfonso of Bourbon-Two Sicilies, Count of Caserta and his wife Princess Maria Antonietta of Bourbon-Two Sicilies.
Title: Princess Anne, Duchess of Calabria
Content: Princess Cristina of Bourbon-Two Sicilies (born 15 March 1966 in Madrid), married Pedro López-Quesada y Fernández-Urrutia on 15 July 1994 in Ciudad Real. They have two children. ; Princess María of Bourbon-Two Sicilies (born 5 April 1967 in Madrid), married Archduke Simeon of Austria (born 29 June 1958 in Katana), son of Archduke Rudolf of Austria and Countess Xenia Czernichev-Besobrasov, on 13 July 1996 in La Toledana. They have five children. ; Prince Pedro of Bourbon-Two Sicilies, Duke of Calabria (born 16 October 1968 in Madrid), married Sofía Landaluce y Melgarejo (born 23 November 1973 in Madrid) on 30 March 2001 in Madrid. They have seven 
Title: Princess Maria di Grazia of Bourbon-Two Sicilies
Content:  Maria was the daughter of Prince Alfonso of Bourbon-Two Sicilies, Count of Caserta and his wife Princess Antonietta of Bourbon-Two Sicilies. She was usually called “Maria Pia”. Her father, the third son of King Ferdinand II of the Two Sicilies, became Head of the Royal House of the Two Sicilies with the death of his elder brother, King Francis II, in 1894. At the time of his birth, however, the Sicilian Royal Family was already exiled in France due to Italian Unification, which took place in 1861.
Title: Prince Carlos of Bourbon-Two Sicilies
Content:  Don Carlos, Prince of Bourbon-Two Sicilies, Infante of Spain (Full Italian name: Carlo Maria Francesco d'Assisi Pasquale Ferdinando Antonio di Padova Francesco de Paola Alfonso Andrea Avelino Tancredi, Principe di Borbone delle Due Sicilie, Infante di Spagna; 10 November 1870 &ndash; 11 November 1949) was the son of Prince Alfonso of the Two Sicilies, Count of Caserta and his wife Princess Maria Antonietta of Bourbon-Two Sicilies, and nephew of the last King of the Two Sicilies, Francis II.
Title: Infante Carlos, Duke of Calabria
Content: Princess Cristina of Bourbon-Two Sicilies (born 15 March 1966 in Madrid), married Pedro López-Quesada y Fernández-Urrutia (born 26 July 1964 in Madrid), cousin of Queen Fabiola of Belgium), on 15 July 1994 in Ciudad Real. They have two children: ; Victoria López-Quesada y Borbón-Dos Sicilias (born 17 January 1997 in Madrid) ; Pedro López-Quesada y Bórbon-Dos Sicilias (born 1 December 2003 in Madrid) ; Princess María of Bourbon-Two Sicilies (born 5 April 1967 in Madrid), married Archduke Simeon of Austria (born 29 June 1958 in Katana), son of Archduke Rudolf of Austria and Countess Xenia Czernichev-Besobrasov, on 13 July 1996 in La Toledana. They have five children. ; Prince Pedro 
Title: Princess Béatrice of Bourbon-Two Sicilies
Content:  Princess Béatrice Marie Caroline Louise Françoise of Bourbon-Two Sicilies (born 16 June 1950 in Saint-Raphaël, Var, France) is the eldest daughter of Prince Ferdinand, Duke of Castro, Castro-line claimant to the headship of the House of Bourbon-Two Sicilies, and his wife, Chantal de Chevron-Villette. Her younger brother, Prince Carlo, Duke of Castro, is the current Castro-line claimant to the headship of the House of Bourbon-Two Sicilies. Since 2014, Béatrice has served as Grand Chancellor of the Sacred Military Constantinian Order of Saint George.
Title: Princess Maria Luisa of Bourbon-Two Sicilies
Content:  Princess Maria Luisa of Bourbon-Two Sicilies (full Italian name: Maria Luisa Immacolata di Borbone, Principessa di Borbone delle Due Sicilie) (21 January 1855, Naples, Two Sicilies &ndash; 23 August 1874, Pau, Armagnac, France ) was the youngest daughter of King Ferdinand II of the Two Sicilies and his wife Archduchess Maria Theresa of Austria. She was known for her piety and for her charity to the poor.
Title: Princess María de los Dolores of Bourbon-Two Sicilies
Content:  Princess Dolores of Bourbon-Two Sicilies (15 November 1909 – 11 May 1996) was a daughter of Prince Carlos of Bourbon-Two Sicilies and his wife Princess Louise of Orléans. Princess Dolores was born into the House of Bourbon-Two Sicilies and was a member of the Polish noble Czartoryski family through her marriage to Prince Augustyn Józef Czartoryski. She was also an aunt of Juan Carlos I of Spain, son of her sister Princess María de las Mercedes of Bourbon-Two Sicilies.

Question: Who is the father of Princess Cristina of Bourbon-Two Sicilies?
Answer: Francis II of the Two Sicilies.
Francis II.