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.
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.
Elisabeth Henriette of Hesse-Kassel
Landgravine Elisabeth Henriëtte of Hesse- Kassel( 18 November 1661 – 7 July 1683) was the daughter of William VI, Landgrave of Hesse- Kassel and Hedwig Sophia of Brandenburg( 1623 – 1683) a sister of Elector Frederick William of Brandenburg.
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.
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.
Princess Karoline Amalie of Hesse-Kassel
Karoline Amalie of Hesse- Kassel( 11 July 1771, Hanau – 22 February 1848, Gotha), was a German princess and member of the House of Hesse- Kassel by birth, and Duchess of Saxe- Gotha- Altenburg by marriage.
She was the second daughter of Landgrave( later Prince) William I of Hesse by Princess Wilhelmina Caroline of Denmark and Norway, daughter of King Frederick V.
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 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.
William VII, Landgrave of Hesse-Kassel
William VII of Hesse- Kassel( 21 June 1651 – 21 November 1670) was Landgrave of Hesse- Kassel.
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.

Question: Who is the paternal grandmother of Prince William Of Hesse-Kassel?
Answer: Princess Mary of Great Britain