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.
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.
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.
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.
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.
Ogawa Mataji
Viscount was a general in the early Imperial Japanese Army.
He was also the father- in- law of Field Marshal Gen Sugiyama.
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.
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.
Princess Louise of Denmark (1750–1831)
Princess Louise of Denmark and Norway( 20 January 1750 – 12 January 1831) was born to Frederick V of Denmark and Louise of Great Britain.
Her eldest daughter, Marie of Hesse- Kassel, was the wife of Frederick VI of Denmark.

Question: Who is the father-in-law of Princess Charlotte Of Denmark?
Answer: Prince Frederick of Hesse-Kassel