 Willem Koster - DelmonteBorn 6- Jun 1891 Amsterdam, Netherland, died 28-1-1944 Auschwitz-Katowice, Poland, 52 or 53 years. Occupation: Accountant. Son of David Willem Koster - Polak and Abigael Delmonte Married to:  Betsy Abraham van Creveld - BosBorn 8 Jul 1884 Amsterdam,Netherland, died 1916 Amsterdam, Netherland, 31 or 32 years. Daughter of Abraham van Creveld - Bosman and Heintje Israel Bos - Rood | |
| 2nd marriage/ relation Willem Koster - DelmonteMarriage/ Related to: Flora HertzBorn 21-4-1892 Sittard, Netherland, died 28-1-1944 Auschwitz-Katowice, Poland, 51 or 52 years Child: | |
1) Louise Abigael Koster - HertzBorn 14-12-1927 Amsterdam, Netherland, died 28-1-1944 Auschwitz-Katowice, Poland, 16 or 17 years | |