Princess Christina Margarethe of Hesse was the eldest daughter of what fifth son of Prince Frederick Charles of Hesse and Princess Margaret of Prussia?
Princess Christina Margarethe of Hesse Princess Christina Margarethe of Hesse (German: "Prinzessin Christina Margarethe von Hessen" ; 10 January 1933 – 22 November 2011) was the eldest daughter of Prince Christoph of Hesse and Princess Sophie of Greece and Denmark. From 1956 to 1962, she was married to Prince Andrew of Yugoslavia, with whom she had two children. Her second marriage to Robert Floris van Eyck, a Dutch artist based in London, lasted from 1962 to 1986.
Louis, Prince of Hesse and by Rhine Louis, Prince of Hesse and by Rhine ("Ludwig Hermann Alexander Chlodwig", 20 November 1908 – 30 May 1968) was the youngest son of Ernest Louis, Grand Duke of Hesse by his second wife, Princess Eleonore of Solms-Hohensolms-Lich.