Her siblings were Rupert von Trapp (1911–1992), Agathe von Trapp (1913–2010), Werner von Trapp (1915–2007), Hedwig von Trapp (1917–1972), Johanna von Trapp (1919–1994), and Martina von Trapp (1921–1951). Along with her six siblings, father, and stepmother, Maria Augusta von Trapp, she was part of the Trapp Family Singers, who inspired the 1959 Broadway musical and the 1965 Academy Award-winning Best Picture "The Sound of Music". Von Trapp sang second soprano in the choir, together with her sister Martina von Trapp. The family fled Austria after the German annexation of Austria, fearing reprisals resulting from declining to sing at Hitler's birthday party and Georg von Trapp's refusal to accept a commission in Nazi Germany's "Kriegsmarine".