Question: Who is Infante Alfonso, Duke Of Calabria's paternal grandfather?

Knowledge 1: Infante Alfonso, Duke of Calabria
Infante Alfonso of Spain, Prince of the Two Sicilies, Duke of Calabria (30 November 1901 – 3 February 1964) was one of two claimants to the title of the head of the House of Bourbon-Two Sicilies from 1960 until his death in 1964.Alfonso was the son of Prince Carlos of Bourbon-Two Sicilies (1870–1949) and his wife, Mercedes, Princess of Asturias (1880–1904).He was born and died in Madrid, Spain.Alfonso's mother was Mercedes, Princess of Asturias, but she died in childbirth in 1904.King Alfonso XIII of Spain was unmarried at the time so as the Princess of the Asturias' eldest son, Alfonso became heir-presumptive to the Spanish crown, though, unlike his mother, he never held the title of Prince of Asturias.He was heir-presumptive until the birth of his cousin, Alfonso in 1907, to Alfonso XIII and Queen Victoria Eugenie. [SEP] Knowledge 2: Prince Carlos of Bourbon-Two Sicilies
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 delleDue Sicilie, Infante di Spagna";10 November 1870, , Bolzano, Austria-Hungary – 11 November 1949, Seville, Spain) 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.
Knowledge 1: Infante Alfonso, Duke of Calabria
Infante Alfonso of Spain, Prince of the Two Sicilies, Duke of Calabria (30 November 1901 – 3 February 1964) was one of two claimants to the title of the head of the House of Bourbon-Two Sicilies from 1960 until his death in 1964.Alfonso was the son of Prince Carlos of Bourbon-Two Sicilies (1870–1949) and his wife, Mercedes, Princess of Asturias (1880–1904).He was born and died in Madrid, Spain.Alfonso's mother was Mercedes, Princess of Asturias, but she died in childbirth in 1904.King Alfonso XIII of Spain was unmarried at the time so as the Princess of the Asturias' eldest son, Alfonso became heir-presumptive to the Spanish crown, though, unlike his mother, he never held the title of Prince of Asturias.He was heir-presumptive until the birth of his cousin, Alfonso in 1907, to Alfonso XIII and Queen Victoria Eugenie. [SEP] Knowledge 2: Infanta Alicia, Duchess of Calabria
Infanta Alicia of Spain, Duchess of Calabria (née: "Princess Alicia Maria Teresa Francesca Luisa Pia Anna Valeria of Bourbon-Parma"; 13 November 1917 – 28 March 2017) was a daughter of Elias, Duke of Parma, and Archduchess Maria Anna of Austria.Alicia was Duchess of Calabria through her marriage to Infante Alfonso, Duke of Calabria (1901–1964).She bore the title of Infanta of Spain from 1936, and took part in some of the activities that the Spanish Royal Family organises.Through marriage, she was maternal half-aunt of Juan Carlos I of Spain.She was born in Vienna, Austria-Hungary, and died in Madrid, Spain.She was paternal first cousin of Boris III of Bulgaria, and paternal half-first cousin of Jean, Grand Duke of Luxembourg, Otto, Crown Prince of Austria and Queen Anne of Romania.
Knowledge 1: Infante Alfonso, Duke of Calabria
Infante Alfonso of Spain, Prince of the Two Sicilies, Duke of Calabria (30 November 1901 – 3 February 1964) was one of two claimants to the title of the head of the House of Bourbon-Two Sicilies from 1960 until his death in 1964.Alfonso was the son of Prince Carlos of Bourbon-Two Sicilies (1870–1949) and his wife, Mercedes, Princess of Asturias (1880–1904).He was born and died in Madrid, Spain.Alfonso's mother was Mercedes, Princess of Asturias, but she died in childbirth in 1904.King Alfonso XIII of Spain was unmarried at the time so as the Princess of the Asturias' eldest son, Alfonso became heir-presumptive to the Spanish crown, though, unlike his mother, he never held the title of Prince of Asturias.He was heir-presumptive until the birth of his cousin, Alfonso in 1907, to Alfonso XIII and Queen Victoria Eugenie. [SEP] Knowledge 2: Prince Pedro, Duke of Calabria
Prince Pedro of Bourbon- Two Sicilies, Duke of Calabria( Spanish:" Pedro Juan María Alejo Saturnino y Todos los Santos"; born 16 October 1968), is the only son of Infante Carlos, Duke of Calabria( 1938 – 2015) and his wife, Princess Anne of Orléans.

Answer: Prince Alfonso