Question: Who is Princess Wilhelmina Caroline Of Denmark's mother-in-law?
Sentence (from "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.
Relevant evidence: Yes