Born ‎10-8-1893 Amsterdam, Netherland, died ‎4- Jun 1943 Sobibor-Biala Podleska, Poland‎, 49 or 50 years. Occupation: Diamond worker. Son of Alexander van Kollem and Anna Frederika Lakmaker‏

Born ‎25-11-1886 Amsterdam, Netherland, died ‎4- Jun 1943 Sobibor-Biala Podleska, Poland‎, 56 or 57 years. Daughter of Joseph de Abraham de Leon/ de Groo and Clara de Leon/ Senior Corone‏