Question: Who is Archduke Karl Pius Of Austria, Prince Of Tuscany's father?

Knowledge 1: Archduke Karl Pius of Austria, Prince of Tuscany
Archduke Karl Pius of Austria, Prince Royal of Hungary and Bohemia, Prince of Tuscany (4 December 1909 – 24 December 1953), called "Carlos Pío de Habsburgo-Lorena y de Borbón" in Spain, was a member of the Tuscan branch of the Imperial House of Habsburg and a Carlist claimant to the throne of Spain under the assumed name of "Carlos VIII".He was the tenth and youngest child of Archduke Leopold Salvator, Prince of Tuscany and Infanta Blanca of Spain. [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: Archduke Karl Pius of Austria, Prince of Tuscany
Archduke Karl Pius of Austria, Prince Royal of Hungary and Bohemia, Prince of Tuscany (4 December 1909 – 24 December 1953), called "Carlos Pío de Habsburgo-Lorena y de Borbón" in Spain, was a member of the Tuscan branch of the Imperial House of Habsburg and a Carlist claimant to the throne of Spain under the assumed name of "Carlos VIII".He was the tenth and youngest child of Archduke Leopold Salvator, Prince of Tuscany and Infanta Blanca of Spain. [SEP] Knowledge 2: Archduke Anton of Austria
Archduke Anton of Austria (Anton Maria Franz Leopold Blanka Karl Joseph Ignaz Raphael Michael Margareta Nicetas von Habsburg-Lorraine; Vienna, 20 March 1901 – Salzburg, 22 October 1987) was an Archduke of Austria and Prince of Tuscany.He was the seventh of ten children born to Archduke Leopold Salvator of Austria, Prince of Tuscany, and Infanta Blanca of Spain, daughter of Carlos, Duke of Madrid.
Knowledge 1: 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. [SEP] Knowledge 2: Archduke Anton of Austria
Archduke Anton of Austria (Anton Maria Franz Leopold Blanka Karl Joseph Ignaz Raphael Michael Margareta Nicetas von Habsburg-Lorraine; Vienna, 20 March 1901 – Salzburg, 22 October 1987) was an Archduke of Austria and Prince of Tuscany.He was the seventh of ten children born to Archduke Leopold Salvator of Austria, Prince of Tuscany, and Infanta Blanca of Spain, daughter of Carlos, Duke of Madrid.

Answer: Archduke Leopold Salvator of Austria