Archduke Leopold of Austria, Prince of Tuscany
Archduke Leopold Maria of Austria, Prince of Tuscany (born in Zagreb 30 January 1897 - died Willimantic,
Connecticut 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.
Archduke Markus Emanuel Salvator of Austria
Archduke Markus Emanuel Salvator of Austria( born 2 April 1946 in Schloss Persenbeug, Persenbeug- Gottsdorf, Lower Austria, Austria) is a member of the Tuscan line of the House of Habsburg and Archduke of Austria, Prince of Tuscany by birth.
Archduke Stefan of Austria
Archduke Stefan of Austria, Prince of Tuscany( 15 August 1932 in Mödling, Lower Austria, Austria – 12 November 1998 in Brighton, Michigan, United States) was a member of the House of Habsburg an Archduke and Prince of Tuscany by birth.
Stefan was the eldest child and son of Archduke Anton of Austria and his wife Princess Ileana of Romania.
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.
Archduke Hubert Salvator of Austria
Archduke Hubert Salvator of Austria, Prince of Tuscany( 30 April 1894 in Schloss Lichtenegg, Wels, Upper Austria, Austria –Hungary – 24 March 1971 in Schloss Persenbeug, Persenbeug- Gottsdorf, Lower Austria, Austria) was a member of the Tuscan line of the House of Habsburg and Archduke of Austria, Prince of Tuscany by birth.
Archduke Leopold Franz of Austria
Archduke Leopold Franz of Austria( born 25 October 1942 at Schloss Leutstetten in Starnberg, Bavaria, Nazi Germany) was a member of the Tuscan line of the House of Habsburg- Lorraine and Archduke and Prince of Austria, Prince of Hungary, Bohemia, and Tuscany by birth.
Leopold Franz was the titular Grand Duke of Tuscany from 21 January 1984 to 18 June 1993.
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.
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.
Archduchess Dolores of Austria
Archduchess Dolores of Austria;( 5 May 1891 – 10 April 1974) was a daughter of Archduke Leopold Salvator of Austria.
She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.
After the fall of the Austro Hungary Empire, she lived under reduced circumstances with her family in Spain, Austria, and Italy.
She died unmarried.
Archduke Rainer of Austria (1895–1930)
Archduke Rainer of Austria;( 21 November 1895 – 25 May 1930) was a member of the House of Habsburg- Lorraine, a member of the Tuscan branch of the Imperial House of Habsburg, an Archduke of Austria and Prince of Tuscany by birth.
He was the eldest son Archduke Leopold Salvator of Austria, Prince of Tuscany.
He served as officer in the Austrian army during World War I.
At the fall of the Habsburg dynasty, he remained in Vienna and worked for a time as taxi driver.
He died unmarried at the age of 34 from blood- poisoning.

Question: Who is Archduke Leopold Of Austria, Prince Of Tuscany's maternal grandfather?
Answer: Carlos, Duke of Madrid