When was Rupert von Trapp father born? 
Rupert von Trapp: Rupert Georg von Trapp, M.D. (1 November 1911 – 22 February 1992) was the firstborn child and eldest son of Georg von Trapp and his first wife, Agatha Whitehead von Trapp. Georg von Trapp: Corvette Captain Georg Johannes Ritter von Trapp (4 April 1880 – 30 May 1947), often incorrectly referred to as Baron (Freiherr) von Trapp, was an Austro-Hungarian Navy officer.
4 April 1880