Princess Louise Charlotte of Saxe-Altenburg
Princess Louise Charlotte of Saxe-Altenburg (Marie Agnes Louise Charlotte; 11 August 1873 – 14 April 1953) was a German noblewoman.
She was a princess of Saxe-Altenburg by birth and a princess of Anhalt by marriage.
Duchess Louise Charlotte of Mecklenburg-Schwerin
Duchess Louise Charlotte of Mecklenburg- Schwerin( 19 November 1779 – 4 January 1801) was the maternal grandmother of Prince Albert, husband of Queen Victoria of the United Kingdom.
Louise Charlotte was born Duchess of Mecklenburg- Schwerin, her father being Friedrich Franz I, Grand Duke of Mecklenburg- Schwerin.
Her mother was Princess Louise of Saxe- Gotha- Altenburg; her sister Charlotte of Mecklenburg- Schwerin( 1784–1840) married King Christian VIII of Denmark.
Princess Marie-Auguste of Anhalt
Princess Marie Auguste of Anhalt( 10 June 1898 – 22 May 1983) was the daughter of Eduard, Duke of Anhalt, and his wife, Princess Louise Charlotte of Saxe- Altenburg.
She married and divorced a son of Kaiser Wilhelm II, then married and divorced a baron.
Princess Charlotte of Denmark
Princess Louise Charlotte of Denmark (30 October 1789 – 28 March 1864) was a Danish princess, and a princess of Hesse-Kassel by marriage to Prince William of Hesse-Kassel.
She played an important role in the succession crisis in Denmark in the first half of the 19th century.
Priscilla Pointer
Priscilla Marie Pointer( born May 18, 1924) is an American stage, film and television character actress.
She began her career in the theater, including productions on Broadway.
Later, Pointer moved to Hollywood to act in films and on television.
She is the mother of Amy Irving, therefore making her the former mother- in- law of filmmakers Steven Spielberg and Bruno Barreto and the mother- in- law of documentary filmmaker Kenneth Bowser, Jr.
Ellen Marsvin
Ellen Marsvin (1 February 1572 – 11 November 1649) was a Danish noble, landowner and county administrator.
She was the mother-in-law of King Christian IV of Denmark, the mother of Kirsten Munk (1598–1658) and grandmother of Leonora Christina Ulfeldt (1621–1698).
Princess Louise of Denmark (1875–1906)
Princess Louise of Denmark(" Louise Caroline Josephine Sophie Thyra Olga")( 17 February
1875 – 4 April 1906) was a Danish princess, the third child and oldest daughter of Frederick VIII of Denmark and his wife, Princess Louise of Sweden and Norway.
Prince Frederick William of Hesse-Kassel
Frederick William George Adolphus, Landgrave of Hesse( 25 November 1820 – 14 October 1884) was the only son of Wilhelm I, Landgrave of Hesse- Kassel- Rumpenheim and Princess Louise Charlotte of Denmark.
Prince William of Hesse-Kassel
Prince William of Hesse-Kassel (24 December 1787 – 5 September 1867), was the first son of Prince Frederick of Hesse-Kassel and Princess Caroline of Nassau-Usingen.
Louise Charlotte of Schleswig-Holstein-Sonderburg-Glücksburg
Louise Charlotte Friederike, Princess of Anhalt- Köthen( née Princess Louise Charlotte Friederike of Schleswig- Holstein- Sonderburg- Glücksburg; 5 March 1749 – 30 March 1812) was a member of the Danish royal family and the consort of Karl George Lebrecht, Prince of Anhalt- Köthen.

Question: Who is Princess Charlotte Of Denmark's mother-in-law?
Answer: Caroline of Nassau-Usingen