 Eliazar William Koster - PolakBorn 18-1-1836 Hoorn, Netherland, died 10-1-1889 Hoorn, Netherland, 52 or 53 years. Occupation: Merchant. Son of Willem Eleazar Koster - Sanders and Rachel Polak - Trompetter Married 16-1-1861 Hoorn, Netherland (27 or 28 years married) to:  Rachel Hartog Oostra - NiasBorn 19-1-1835 Medemblik, Netherland, died 1910 Amsterdam, Netherland, 74 or 75 years. Daughter of Hartog Isaac Oostra/ du Mosc and Elisabeth Isaac Nias/ van Esse Children: | |||
1) Willem Eleazar Koster - OostraBorn 23-9-1863 Medemblik, Belgium, died 16-11-1920 Amsterdam, Netherland, 56 or 57 years. Occupation: Musician | |||
3) Levie Koster - OostraBorn 10-7-1872 Medemblik, died 23-4-1948 Hoorn, Netherland, 75 or 76 years. Occupation: Butcher, cattle merchant | |||
4) Henriette Koster - OostraBorn 1872 Medemblik, Belgium, died 3- jun 1917 Hoorn, Netherland, 44 or 45 years | |||