William VII, Landgrave of Hesse-Kassel
William VII of Hesse- Kassel( 21 June 1651 – 21 November 1670) was Landgrave of Hesse- Kassel.
Charles I, Landgrave of Hesse-Kassel
Charles of Hesse- Kassel( 3 August 1654 – 23 March 1730), of the House of Hesse, was the Landgrave of Hesse- Kassel from 1670 to 1730.
Margravine Hedwig Sophie of Brandenburg
Hedwig Sophia of Brandenburg( 14 July 1623, Berlin- 26 June 1683, Schmalkalden) was Landgravine consort of Hesse- Kassel by marriage to William VI, Landgrave of Hesse- Kassel, and regent from 1663 until 1677 during the minority of her sons, William VII, Landgrave of Hesse- Kassel and Charles I, Landgrave of Hesse- Kassel.
Alexander Frederick, Landgrave of Hesse
Alexander Frederick, Landgrave of Hesse( 25 January 1863, Copenhagen – 26 March 1945) was a Hessian Prince.
He was the son of Prince Frederick William of Hesse- Kassel and Princess Anna of Prussia.
From 1888–1925 he was Head of the House of Hesse, but abdicated his position to his brother Prince Frederick Charles of Hesse.
He was visually handicapped from birth, and this, in addition to his morganatic marriage, played a part in his decision to abdicate.
Princess Marie Luise Charlotte of Hesse-Kassel
Princess Marie Luise Charlotte of Hesse- Kassel,( 9 May 1814 – 28 July 1895) was a member of the House of Hesse- Kassel by birth.
Through her marriage to Prince Frederick Augustus of Anhalt- Dessau, she became a princess of Anhalt- Dessau.
Prince Frederick of Hesse-Kassel
Prince Frederick of Hesse-Kassel (11 September 1747 – 20 May 1837) was a younger member of the dynasty that ruled the Landgraviate of Hesse-Kassel (or Hesse-Cassel) and a Danish general.
He was born as the youngest son of Hereditary Prince Frederick of Hesse-Kassel (the future Landgrave Frederick II) and Princess Mary of Great Britain.
He was the last surviving grandchild of George II of Great Britain, dying one month before Queen Victoria (granddaughter of his first cousin King George III) ascended to the throne.
Princess Mary of Great Britain
Princess Mary of Great Britain (5 March 1723 – 14 January 1772) was the second-youngest daughter of King George II of Great Britain and his wife, Caroline of Ansbach, and Landgravine of Hesse-Kassel as the wife of Frederick II, Landgrave of Hesse-Kassel.
George Charles of Hesse-Kassel
George Charles of Hesse-Kassel (8 January 1691 – 5 March 1755) was a prince of Hesse-Kassel and a Prussian General.
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.
Sophie Charlotte of Hesse-Kassel
Sophie Charlotte of Hesse- Kassel( 16 July 1678, Kassel – 30 May 1749, Bützow) was a princess of Hesse- Kassel and by marriage Duchess of Mecklenburg.

Question: Who is the maternal grandmother of Prince Frederick Of Hesse-Kassel?
Answer: Caroline of Ansbach