unnamed son von Hessen-Darmstadt third son of Georg Donatus, Hereditary Grand Duke of Hesse and Princess Cecilie of Greece and Denmark (1937–1937) Parents Georg Donatus, Hereditary Grand Duke of Hesse Princess Cecilie of Greece and Denmark Children Siblings Princess Johanna of Hesse and by Rhine Prince Ludwig of Hesse and by Rhine Prince Alexander of Hesse and by Rhine