sentences:  He succeeded his brother Prince Adolf II as head of the Princely House following his death in a plane crash in Mexico on 26 March 1936.Following his death at Hanover, he was succeeded as head of the Princely House by his second son, Philipp-Ernst.He was married at Simbach am Inn in April 1925 to his second cousin, Princess Bathildis of Schaumburg-Lippe (1903–1983), only daughter of Prince Albert of Schaumburg-Lippe and Duchess Elsa of Württemberg.