Born ‎29-8-1878 Amsterdam, Netherland‎. Son of Hartog de Jong and Elisabeth Konijn‏

Born ‎10-3-1887 Amsterdam, Netherland, died ‎21-5-1943 Sobibor-Biala Podleska, Poland‎, 55 or 56 years, ‎1st marriage/ related to: Siegfried Herman Content, ‎2nd marriage to: Salomon de Jong - Konijn. Daughter of Hijman Salomon Swaab and Clara van Praag‏