Huno Herzog von Oldenburg German engineer (b. 1940) Parents Nikolaus, Hereditary Grand Duke of Oldenburg Princess Helene of Waldeck and Pyrmont Children Beatrix von Storch Sophie von Oldenburg Siblings Duchess Eilika of Oldenburg Duchess Altburg of Oldenburg Duke Peter of Oldenburg Anton-Günther, Duke of Oldenburg Duke Johann of Oldenburg Duchess Rixa of Oldenburg Duke Friedrich August of Oldenburg Duke Egilmar of Oldenburg Partners Felicitas-Anita Gräfin Schwerin von Krosigk