Born ‎8-10-1874 The Hague, Netherland, died ‎2- Apr 1943 Sobibor-Biala Podleska, Poland‎, 68 or 69 years. Daughter of Israel (Rolie) Viskoper and Rachel Huisman/ van Ul‏

Born ‎13-9-1869 Amsterdam, Netherland, died ‎2- Apr 1943 Sobibor-Biala Podleska, Poland‎, 73 or 74 years. Occupation: Diamond worker, ‎1st marriage to: Klara Gobets/ Ba, ‎2nd marriage/ related to: Naatje Viskoper/ Huisma. Son of Gabriel Groen and Ester Porcelein‏