Title: Archduke Leopold of Austria, Prince of Tuscany
Content:  Archduke Leopold Maria of Austria, Prince of Tuscany (Leopold, Erzherzog von Österreich-Toskana, 30 January 1897 – 14 March 1958) was the second son of Archduke Leopold Salvator, Prince of Tuscany and Infanta Blanca of Spain. At the fall of Habsburg monarchy he remained in Austria and recognized the new republic in order to marry Dagmar, Baroness von Nicolics-Podrinska. The couple had one daughter. After divorcing his wife in 1931, Leopold eventually emigrated to the United States where he became a naturalized American citizen under the name Leopold Lorraine, and where he remarried. He died in 1958 in Connecticut.
Title: Archduke Leopold Salvator of Austria
Content:  Archduke Leopold Salvator, Prince of Tuscany (Leopold Salvator Maria Joseph Ferdinand Franz von Assisi Karl Anton von Padua Johann Baptist Januarius Aloys Gonzaga Rainer Wenzel Galius von Österreich-Toskana) (15 October 1863 &ndash; 4 September 1931), was the son of Archduke Karl Salvator of Austria and Princess Maria Immaculata of Bourbon-Two Sicilies.
Title: Archduke Leopold Franz of Austria
Content:  Archduke Leopold Franz of Austria (Leopold Franz Peter Ferdinand Maria Joseph Gottfried Georg Karl Otto Rudolf Michael, Erzherzog von Österreich, Prinz von Toskana) (born 25 October 1942 at Leutstetten in Starnberg, Bavaria - died 23 June 2021 ) was a member of the Tuscan line of the House of Habsburg-Lorraine. Outside of Austria and Hungary, which abolished and outlawed all titles of nobility with the Adelsaufhebungsgesetz in 1919, he may be referred by his titles Archduke of Austria, Prince of Hungary and Bohemia, Prince of Tuscany with the style His Imperial and Royal Highness. Leopold Franz was the titular Grand Duke of Tuscany from 21 January 1984 to 18 June 1993.
Title: Archduke Alexander Leopold of Austria
Content:  Archduke Alexander Leopold was born in Florence, Tuscany, as the sixth child and fourth son of Leopold I, Grand Duke of Tuscany (later Leopold II, Holy Roman Emperor), and Infanta Maria Luisa of Spain. During his education, Alexander Leopold excelled in mathematics and chemistry. He had a fine physique and his father thus wanted him to pursue a military career, with the intent to eventually appoint him president of the Hofkriegsrat.
Title: Archduke Leopold Ferdinand of Austria
Content:  Archduke Leopold Ferdinand of Austria (2 December 1868 &ndash; 4 July 1935) was the eldest son of Ferdinand IV, Grand Duke of Tuscany, and Alice of Bourbon-Parma.
Title: Archduke Leopold Ferdinand of Austria
Content: 2 December 1868 – 29 December 1902: His Imperial and Royal Highness Archduke Leopold Ferdinand of Austria, Prince of Tuscany ; 29 December 1902 – 4 July 1935: Leopold Wölfling 
Title: Archduke Franz Josef of Austria, Prince of Tuscany
Content:  Archduke Franz Josef of Austria was born on February 4, 1905, in Vienna, the ninth child and fourth son of Archduke Leopold Salvator of Austria and Infanta Blanca of Spain. His father, a member of the Tuscan line of the Habsburg family and thus a descendant of Emperor Leopold II, had been Inspector General of the Austrian Artillery and Commander of the 18th infantry regiment. Franz Josef's mother, Infanta Blanca of Spain, was the eldest daughter of Carlos, Duke of Madrid, who had been as Carlos VII, pretender to the Spanish throne. Archduke Franz Josef was given the baptismal names Franz Josef Karl Leopold Blanka Adelgunde Ignatius Rafael Michael von Habsburg-Lothringen. 
Title: Leopold II, Holy Roman Emperor
Content:   Leopold was born in Vienna as his parents' third son. Initially selected for a clerical career, he received education with focus on theology. In 1753, he was engaged to Maria Beatrice d'Este, heiress to the Duchy of Modena. The marriage was never consummated and Maria Beatrice instead married Leopold's brother, Archduke Ferdinand. Upon the early death of his older brother Archduke Charles in 1761, the family decided that Leopold was going to succeed his father as Duke of Tuscany. Tuscany had been envisioned and designated as a Secundogeniture, a territory and title bestowed upon the second born son, which was greater than an Appanage. On 5 August 1765 Leopold married the Infanta Maria Luisa of Spain, daughter of Charles III of Spain and Maria Amalia of Saxony. Upon the death of his father, Francis I on 18 August 1765, he became Grand Duke of Tuscany.
Title: Leopold II, Grand Duke of Tuscany
Content:  27 August 1917), married in Schloss Brandeis, Bohemia, on 31 May 1865 Karl, Prince of Isenburg-Büdingen (Birstein, 29 July 1838 – Schlackenwerth, 4 April 1899). Her husband was a grandson of Karl, last sovereign Prince of Isenburg. They are the ancestors of Sophie, Princess of Prussia, wife of Georg Friedrich, Prince of Prussia, the head of the House of Hohenzollern. ; Archduke Ludwig Salvator of Austria (4 August 1847 – 12 October 1915). ; Archduke Johann Salvator of Austria (25 November 1852 – reported lost at sea in 1890). There was speculation of his survival under an alias (Johann Orth). In Dresden on 28 October 1817 by proxy and in Florence on 16 November 1817 in person, Leopold married Princess Maria 
Title: Archduke Leopold of Austria, Prince of Tuscany
Content: Gabrielle of Habsburg-Lorraine (Vienna 15 May 1921 – Zürich 1996) (created Countess of Wolfenau in 1922), who married Johannes (also Hans or Jan) von der Mühll (1918 – 1977), a Swiss banker, in 1948 and had two daughters and a son in Switzerland before her divorce in 1958. Archduke Leopold of Austria was born in Agram (the historic Austrian-German name for what is now the city of Zagreb in Croatia), the fifth child and second son of Archduke Leopold Salvator of Austria, Prince of Tuscany and Infanta Blanca of Spain (daughter of Carlos, Duke of Madrid). He received the names Leopold Maria Alfons Blanka Karl Anton Beatrix Michael Joseph Peter Ignatz von Habsburg-Lothringen. During World War I 

Question: Who is the father of Archduke Leopold of Austria, Prince of Tuscany?
Answer: Archduke Leopold Salvator of Austria.