Prince Nikolaus of Liechtenstein
Prince Nikolaus Ferdinand Maria Josef Raphael of Liechtenstein( born 24 October 1947) is the non-resident Ambassador of Liechtenstein to the Holy See and a younger brother of the reigning Prince of Liechtenstein, Hans- Adam II.
Prince Aloys of Liechtenstein
Prince Aloys of Liechtenstein( Aloys Gonzaga Maria Adolf; 17 June 1869 in Hollenegg – 16 March 1955 in Vaduz) was the son of Prince Alfred of Liechtenstein( 1842–1907) and Princess Henriette of Liechtenstein( 1843 – 1931), daughter of Alois II of Liechtenstein.
The maternal nephew and first cousin of Franz I of Liechtenstein, Prince Aloys renounced his rights to the succession on 26 February 1923, in favor of his son Franz Joseph II.
He was the 1,177th Knight of the Order of the Golden Fleece in Austria.
Prince Karl Borromäus of Liechtenstein
Prince Karl (Karl Borromäus)
Michael Joseph of Liechtenstein (Vienna, 29 September 1730 – Vienna, 21 February 1789) was the second son of Emanuel, Prince of Liechtenstein (1700–1771) and "Maria" Anna "Antonia", Countess of Dietrichstein-Weichselstädt, Baroness of Hollenburg and Finkenstein, and younger brother of Franz Joseph I, Prince of Liechtenstein.
He was the 805th Knight of the Order of the Golden Fleece in Austria in 1772.
Prince Alfred of Liechtenstein
Prince Alfred Louis of Liechtenstein( Alfred Aloys Eduard; 11 June 1842 in Prague – 8 October 1907 in Frauenthal castle) was the son of Prince Franz de Paula of Liechtenstein( 1802 – 1887) and Countess Julia Eudoxia Potocka- Piława( 1818–1895), older brother of Prince Louis of Liechtenstein, and cousin and brother- in- law of Franz I of Liechtenstein.
He was the 1,143rd Knight of the Order of the Golden Fleece in Austria in 1903.
Anna Maria of Liechtenstein
Anna Maria Antonie of Liechtenstein( 11 September 1699 in Vienna – 20 January 1753 in Vienna), was a princess consort of Liechtenstein; married 19 April 1718 to her cousin prince Joseph Wenzel I, Prince of Liechtenstein.
Eleonore of Liechtenstein
Maria Eleonore of Liechtenstein née Oettingen-Oettingen and Oettingen-Spielberg (Oettingen, 7 July 1745 – Vienna, 26 November 1812) was a princess of Liechtenstein by marriage to Prince Karl Borromäus of Liechtenstein, and a politically influential Austrian salonist.
Between 1768 and 1790, she acted as the political adviser of Emperor Joseph II through her salon or discussion circle.
Prince Alexander of Liechtenstein (1929–2012)
Alexander of Liechtenstein( full name:" Alexander Friedrich Manfred Maria von und zu Liechtenstein"; 14 May 1929 – 16 March 2012) was a Prince of the House of Liechtenstein and a businessman in the forestry and timber industries.
His son Prince Stefan of Liechtenstein was Liechtenstein's ambassador to Germany since 2007.
Princess Henriette of Liechtenstein
Princess Henriette of Liechtenstein( German:" Henriette Maria Norberta, Prinzessin von und zu Liechtenstein"; 6 June 1843 – 24 December 1931) was a Princess of Liechtenstein and member of the Princely House of Liechtenstein.
Leopoldine von Sternberg
Leopoldine von Sternberg( Maria Leopoldine Walburga Eva; 11 December 1733, Vienna – 1 March 1809, Valtice) was a princess consort of Liechtenstein by marriage to Prince Franz Joseph I.
She is noted to have belonged to the discussion circle of Eleonore of Liechtenstein, who acted as political advisers to Emperor Joseph II.
Prince Joseph Wenzel of Liechtenstein
Prince Joseph Wenzel of Liechtenstein, Count Rietberg( born 24 May 1995) is the eldest child of Prince Alois of Liechtenstein, the Regent and Hereditary Prince of Liechtenstein, and his wife Princess Sophie of Bavaria, Duchess in Bavaria, he is also the eldest grandchild of the current ruling prince of Liechtenstein.
He is second in the line of succession to the Liechtensteiner throne through his father.

Question: Who is Eleonore Of Liechtenstein's sibling-in-law?
Answer: Franz Joseph I