Born ‎± 1837 Leiden, Netherland, died ‎19-5-1862 Delft, Netherland‎, approximately 25 years. Son of Daniel Koetser and Roosje de Leeuw‏

Born ‎21-6-1827 Amsterdam, Netherland, died ‎3- sep 1861 Delft, Netherland‎, 33 or 34 years. Daughter of Juda David van Praag and Sipora Marcus Samson‏