Ingeborg Alix von Oldenburg (1901-1996) (1901–1996) Parents Duchess Elisabeth Alexandrine of Mecklenburg-Schwerin Frederick Augustus II, Grand Duke of Oldenburg Children Marie Alix, Duchess of Schleswig-Holstein Georg-Moritz Prinz zu Schaumburg-Lippe unnamed son zu Schaumburg-Lippe Siblings Duchess Sophia Charlotte of Oldenburg Alexandrine von Holstein-Gottorp Nikolaus, Hereditary Grand Duke of Oldenburg Duke Friedrich August of Oldenburg Duchess Altburg of Oldenburg Duchess Margarete of Oldenburg Partners Prince Stefan of Schaumburg-Lippe