Sophia Eleonore of Hesse-Darmstadt
Sophia Eleonore of Hesse- Darmstadt( 7 January 1634 in Darmstadt – 7 October 1663 in Bingenheim, now part of Echzell), was Landgravine of Hesse- Darmstadt by birth and by marriage Landgravine of Hesse- Homburg.
She was a daughter of Landgrave George II of Hesse- Darmstadt( 1605 – 1661) from his marriage to Sophia Eleonore( 1609 – 1671), the daughter of Elector John George I of Saxony.
Louis VI, Landgrave of Hesse-Darmstadt
Louis VI of Hesse-Darmstadt  (25 January 1630 – 24 April 1678) was Landgrave of Hesse-Darmstadt from 1661 to 1678.
He was the eldest of three sons of the Landgrave George II of Hesse-Darmstadt and Sophia Eleonore of Saxony.
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 II, Landgrave of Hesse-Darmstadt
George II of Hesse-Darmstadt, (17 March 1605, in Darmstadt – 11 June 1661) was the Landgrave of Hesse-Darmstadt from 1626 to 1661.
He was the son of Ludwig V and Magdalene of Brandenburg.
He married Sophia Eleonore of Saxony on 1 April 1627.
From 1645 to 1648 he led the so-called "Hessenkrieg" against the Landgravine Amalie Elizabeth of Hesse-Kassel over the inheritance of the extinct line of Hesse-Marburg.
This conflict resulted in the loss of Hesse-Marburg to Hesse-Kassel.
William II, Landgrave of Hesse-Wanfried-Rheinfels
William II, Landgrave of Hesse- Wanfried- Rheinfels( also known as" William the Younger"; born: 25 August 1671 in Langenschwalbach; died: 1 April 1731 in Paris, and also buried there) was a son of the Landgrave Charles of Hesse- Wanfried( 1649 – 1711) and his first wife, Sophie Magdalene of Salm- Reifferscheid( d. 1675).
He succeeded his father as Landgrave of Hesse- Wanfried and Hesse- Rheinfels.
After 1711, he styled himself" Landgrave of Hesse- Rheinfels".
Louis VIII, Landgrave of Hesse-Darmstadt
Louis VIII (German: "Ludwig") (5 April 1691 – 17 October 1768) was the Landgrave of Hesse-Darmstadt from 1739 to 1768.
He was the son of Ernest Louis, Landgrave of Hesse-Darmstadt and Margravine Dorothea Charlotte of Brandenburg-Ansbach.
Adelaide of Hesse
Adelaide of Hesse( after 1323 – after May 26, 1371) was a daughter of Henry II, Landgrave of Hesse, and his wife Elisabeth of Thuringia, daughter of Frederick I, margrave of Meissen.
Adelaide was a member of the House of Hesse.
Sophia Eleonore of Saxony
Sophia Eleonore of Saxony (23 November 1609 – 2 June 1671) was a duchess of Saxony by birth and the landgravine of Hesse-Darmstadt from 1627 to 1661 through her marriage to Landgrave George II.
She was the eldest surviving child of John George I, Elector of Saxony, and Magdalene Sibylle of Prussia.
Louis V, Landgrave of Hesse-Darmstadt
Louis V of Hesse-Darmstadt (24 September 1577 – 27 July 1626) was the Landgrave of Hesse-Darmstadt from 1596 to 1626.
He was born on 24 September 1577 as the son of George I, Landgrave of Hesse-Darmstadt and Magdalene of Lippe.
In 1604 he inherited a part of Hessen-Marburg after the death of Louis IV of Hesse-Marburg who was childless.
The other half went to Maurice of Hesse-Kassel (or Hesse-Cassel), but since Maurice was a Calvinist, Ludwig claimed a right on the whole of Hesse-Marburg.
Lutheran professors of the University of Marburg who refused to convert to Calvinism founded in 1607 the University of Gießen which was named "Ludoviciana".
This led to a conflict during the Thirty Years' War, between Louis V, who stood on the side of the Emperor, and Maurice, who was on the side of the Protestants.
Hesse-Darmstadt suffered severely from the ravages from the Swedes during the conflict.
The Landgrave died in 1626 and he was succeeded by George II, Landgrave of Hesse-Darmstadt.
In 1722, Johann Georg Liebknecht, an astronomer at the University of Gießen, named a star, which he thought was a planet, Sidus Ludoviciana after Ludwig V.
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.

Question: Who is George Ii, Landgrave Of Hesse-Darmstadt's father-in-law?