Question: Who is Archduchess Maria Antonia Of Austria (1899–1977)'s maternal grandfather?

Knowledge 1: Archduchess Maria Antonia of Austria (1899–1977)
Archduchess Maria Antonia of Austria (13 July 1899 – 22 October 1977) was a daughter of Archduke Leopold Salvator of Austria and Infanta Blanca of Spain.She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.In 1919, after the fall of the Austro Hungary Empire, she moved with her family to Spain.In 1924 she married Ramón de Orlandis y Villalonga, a Spanish aristocrat.When she became a widow during the Spanish civil war Archduchess Maria Antonia moved permanently to South America where she remarried. [SEP] Knowledge 2: Infanta Blanca of Spain
Infanta Blanca of Spain (7 September 1868 – 25 October 1949) was the eldest child of Carlos, Duke of Madrid, Carlist claimant to the throne of Spain and his wife Princess Margherita of Bourbon-Parma.Blanca was a member of the House of Bourbon and - according to the Carlists - an Infanta of Spain by birth.In 1889 she married Archduke Leopold Salvator of Austria.The couple had ten children.The family left Austria after the end of the Monarchy and finally settled in Barcelona.When the male line of Blanca's family died out at the death of her uncle, Alfonso Carlos, Duke of San Jaime, some of the Carlists recognized her as the legitimate heiress to the Spanish throne.
Knowledge 1: Archduchess Maria Antonia of Austria (1899–1977)
Archduchess Maria Antonia of Austria (13 July 1899 – 22 October 1977) was a daughter of Archduke Leopold Salvator of Austria and Infanta Blanca of Spain.She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.In 1919, after the fall of the Austro Hungary Empire, she moved with her family to Spain.In 1924 she married Ramón de Orlandis y Villalonga, a Spanish aristocrat.When she became a widow during the Spanish civil war Archduchess Maria Antonia moved permanently to South America where she remarried. [SEP] Knowledge 2: Princess Maria Antonia of the Two Sicilies
Princess Maria Antonia of the Two Sicilies (Maria Antonietta Giuseppa Anna; 19 December 1814 – 7 November 1898) was the Grand Duchess of Tuscany from 1833 to 1859 as the consort of Leopold II.In signature, she used "Maria Antonietta".
Knowledge 1: Archduchess Maria Antonia of Austria (1899–1977)
Archduchess Maria Antonia of Austria (13 July 1899 – 22 October 1977) was a daughter of Archduke Leopold Salvator of Austria and Infanta Blanca of Spain.She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.In 1919, after the fall of the Austro Hungary Empire, she moved with her family to Spain.In 1924 she married Ramón de Orlandis y Villalonga, a Spanish aristocrat.When she became a widow during the Spanish civil war Archduchess Maria Antonia moved permanently to South America where she remarried. [SEP] Knowledge 2: Maria Antonia of Austria
Maria Antonia of Austria (Maria Antonia Josepha Benedicta Rosalia Petronella; 18 January 1669 – 24 December 1692) was an Electress of Bavaria by marriage to Maximilian II Emanuel, Elector of Bavaria.She was the eldest daughter and only surviving child of Holy Roman Emperor Leopold I and his wife Margaret Theresa of Spain.She was the heir to the Spanish throne after her maternal uncle Charles II of Spain from 1673 until her death.

Answer: Carlos, Duke of Madrid