Wilhelm, Landgrave of Hesse-Philippsthal-Barchfeld German (b. 1933) Parents Prince Wilhelm of Hesse-Philippsthal-Barchfeld Princess Marianne of Prussia Children Otto Prinz von Hessen-Philippsthal-Barchfeld Wilhelm Erbprinz von Hessen-Philippsthal-Barchfeld Siblings Hermann Prinz von Hessen-Philippsthal-Barchfeld Johanna Prinzessin von Hessen-Philippsthal-Barchfeld Partners Oda-Mathilde von Garmisson