Born ‎1872 Medemblik, Belgium, died ‎3- Jun 1917 Hoorn, Netherland‎, 44 or 45 years. Daughter of Eliazar William Koster - Polak and Rachel Hartog Oostra - Nias‏

Born ‎22-8-1883 Hoorn, Netherland, died ‎4- Jun 1943 Sobibor-Biala Podleska, Poland‎, 59 or 60 years. Occupation: Merchant, ‎1st marriage to: Henriette Koster - Oostra, ‎2nd marriage to: Louisa Bremer - Koster. Son of Gerrit Trompetter - Trompetter and Regina Kan - Trompetter‏