Born ‎27-2-1878 Amsterdam, Netherland, died ‎26-12-1942 Amsterdam, Netherland‎, 63 or 64 years. Occupation: Diamond buyer. Son of Jacob Bak - Viskoper and Anna de Groot - Fles‏

Born ‎2- May 1883 Rotterdam, Netherland, died ‎2- Jul 1943 Sobibor-Biala Podleska, Poland‎, 60 years, ‎1st marriage/ related to: Joseph Bak - de Groot, ‎2nd marriage to: Isaac van Witsen - Hes. Daughter of Joseph van Witsen/ He and Judic Meijer Hofstede - Bloemhof‏