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.
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.
William I, Elector of Hesse
William I, Elector of Hesse (3 June 1743 – 27 February 1821) was the eldest surviving son of Frederick II, Landgrave of Hesse-Kassel (or Hesse-Cassel) and Princess Mary of Great Britain, the daughter of George II.
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.
Maximilian of Hesse-Kassel
Maximilian of Hesse- Kassel( 28 May 1689 – 8 May 1753) was a prince of Hesse- Kassel and a Generalfeldzeugmeister, Generalfeldmarschall and finally Reichsgeneralfeldmarschall in the army of the Holy Roman Empire.
Marie Friederike of Hesse-Kassel
Marie Frederike of Hesse-Kassel (14 September 1768, Hanau – 17 April 1839, Hanau) was a German noblewoman and by marriage Princess and later Duchess of Anhalt-Bernburg.
She was a daughter of William I, Elector of Hesse, and his wife, Princess Wilhelmina Caroline of Denmark.
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.
William VII, Landgrave of Hesse-Kassel
William VII of Hesse- Kassel( 21 June 1651 – 21 November 1670) was Landgrave of Hesse- Kassel.
Hedwig of Hesse-Kassel
Hedwig of Hesse- Kassel( born 30 June 1569 in Kassel; died: 7 July 1644 in Hagen) was a princess of Hesse- Kassel by birth and by marriage a Countess of Schaumburg.

Question: Who is Marie Friederike Of Hesse-Kassel's paternal grandmother?
Answer: Princess Mary of Great Britain