Archduke Karl Ludwig of Austria
Archduke Karl Ludwig Joseph Maria of Austria( 30 July
1833 – 19 May 1896) was the younger brother of Franz Joseph I of Austria( 1830 – 1916), the father of Archduke Franz Ferdinand of Austria( 1863 – 1914), whose assassination ignited World War I, and grandfather of the last emperor, Charles I.
Archduchess Elisabeth Franziska of Austria (1892–1930)
Archduchess Elisabeth Franziska Marie Karoline Ignatia Salvator (27 January 1892 – 29 January 1930) was the eldest daughter of Archduke Franz Salvator of Austria and Archduchess Marie Valerie of Austria.
Through her mother, she was a granddaughter of Emperor Franz Joseph I of Austria.
Archduchess Yolande of Austria
Archduchess Yolande of Austria( née Princesse Yolande Marie Jeanne Charlotte de Ligne; born 6 May 1923) is the widow of Archduke Carl Ludwig of Austria.
Maria Theresa of Austria-Este (1849–1919)
Maria Theresa of Austria-Este (Maria Theresa Henriette Dorothee; 2 July 1849 – 3 February 1919) was the last Queen of Bavaria.
She was the daughter and only child of Archduke Ferdinand of Austria-Este and his wife, Archduchess Elisabeth of Austria.
Archduchess Maria Anna of Austria (1835–1840)
Archduchess
Maria Anna of Austria( 27 October 1835 – 5 February 1840), was by birth an Archduchess of Austria and member of the House of Habsburg.
She was the fourth child and only daughter of Archduke Franz Karl of Austria and his wife, Princess Sophie of Bavaria, daughter of Maximilian I Joseph of Bavaria and his second wife Caroline of Baden.
Eduard von Habsburg
Eduard von Habsburg( born January 12, 1967), also known as Archduke Eduard of Austria is Hungary ’s ambassador to the Holy See and Sovereign Military Order of Malta.
He is son of Archduke Michael of Austria( Archduke Joseph Francis's youngest child) and the great- great- grandson of Emperor Franz Joseph I.
He is married to Baroness Maria Theresia von Gudenus, descendant of Archduke Johann of Austria and has six children.
Princess Ileana of Romania
Princess Ileana of Romania, also known as Mother Alexandra (5 January 1909 – 21 January 1991), was the youngest daughter of King Ferdinand I of Romania and his consort, Queen Marie of Romania.
She was a great-granddaughter of Queen Victoria and of Tsar Alexander II.
She was born as "Her Royal Highness" Ileana, Princess of Romania, Princess of Hohenzollern-Sigmaringen.
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.
Charles, Margrave of Burgau
Charles, Margrave of Burgau, also known as" Charles of Austria",( 22 November 1560 at Křivoklát Castle in Bohemia – 30 October 1618 in Überlingen), was the son of Archduke Ferdinand II of Austria and his first morganatic marriage to Philippine Welser.
He was the brother of Andrew of Austria.
Archduke Otto of Austria (1865–1906)
Archduke Otto Franz Joseph Karl Ludwig Maria of Austria (21 April 1865 – 1 November 1906) was the second son of Archduke Karl Ludwig of Austria (younger brother of Emperor Franz Joseph I of Austria) and his second wife, Princess Maria Annunciata of Bourbon-Two Sicilies.
He was the father of Charles I of Austria, the last Emperor of Austria.

Question: When did Archduke Stefan Of Austria's mother die?
Answer: 21 January 1991