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.
Archduke Leo Karl of Austria
Leo Karl Maria Cyril-Methodius Habsburg-Lorraine, Archduke of Austria (5 July 1893, Pula, Austria-Hungary – 28 April 1939, Bestwina, Poland) was the fifth child and the second son of Archduke Charles Stephen of Austria and Archduchess Maria Theresia, Princess of Tuscany.
Archduke Leo Karl was his father’s
answer to the Eastern European question, and became the would-be Regent of the Habsburgs' zone of influence in the Balkan region.
Count Leo Stefan of Habsburg
Count Leo Stefan Maria Carl Wolfgang Rudolf von Fidelis of Habsburg (born June 12, 1928 in Żywiec) is a morganaut of the House of Habsburg-Lorraine and the representative of the Teschen ducal line.
He is the son of Archduke Leo Karl (1893–1939) and Countess Maria-Klothilde de Thuillières von Montjoye-Vaufrey et de la Roche (1893–1978) and a grandson of Archduke Charles Stephen of Austria.
He is today the heir to the Dukedom of Teschen.
because of the unequal marriage of his parents.
He thus is only entitled to use the title Count of Habsburg.
He has seven children of whom Count Albrecht of Habsburg (born 1963), who is his heir to the Dukedom, .
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.
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.
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.
Archduke Charles Stephen of Austria
Archduke Charles Stephen Eugene Viktor Felix Maria of Austria (5 September 1860 – 7 April 1933) was a member of the House of Habsburg, a Grand Admiral in the Austro-Hungarian Navy and candidate for the Polish crown.
Leo Meyer (philologist)
Leo Karl Heinrich Meyer( 3 July 1830 – 6 June 1910) was a German philologist who spent much of his career in the Governorate of Livonia( now Estonia).
Archduke Ludwig Viktor of Austria
Archduke Ludwig Viktor Joseph Anton of Austria( 15 May 1842 – 18 January 1919) from the House of Habsburg was the youngest son born to Archduke Franz Karl of Austria and Princess Sophie of Bavaria and younger brother of Emperor Franz Joseph I of Austria.
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.

Question: When is Archduke Leo Karl Of Austria's father's birthday?
Answer: 5 September 1860