Career
Wilhelm-Karl was the youngest of Prince Oskar of Prussia and Countess Ina Marie von Bassewitz"s four children. Prince Wilhelm-Karl worked tirelessly to keep the Order intact during the Cold War and helped to reunite its membership after the fall of East Germany. In 1952, Prince Wilhelm-Karl married Armgard von Veltheim (born 17 February 1926).
Princess Donata-Viktoria of Prussia (born 24 December 1952).
Prince Wilhelm-Karl of Prussia (born 25 August 1955). Prince Oskar of Prussia (born 29 November 1993)
Princess Wilhelmine of Prussia (born 7 July 1995)
Prince Albert of Prussia (born 13 July 1998).