| Laurens Jan Koster |
| Laurens Jan Koster | |
| G: | ca. 1875 |
| Hoorn | |
| O: | 22 okt 1918 |
| Groningen | |
| Martha Albeda |
| Martha Albeda | |
| G: | ca. 1876 |
| Groningen | |
| H: | 13 dec 1900 |
| Schiedam | |
| O: | Ja, datum echter onbekend |
| Anna Maria Koster |
| Anna Maria Koster | |
| G: | 17 jul 1877 |
| Schiedam | |
| O: | 3 mei 1879 |
| Schiedam | |
|
| Anna Maria Jaske |
| Anna Maria Jaske | |
| G: | 4 apr 1841 |
| Rotterdam | |
| O: | Ja, datum echter onbekend |
| Jan Koster |
| Jan Koster | |
| G: | ca. 1846 |
| Hoorn | |
| H: | 1 sep 1871 |
| Hoorn | |
| O: | Ja, datum echter onbekend |
| Arnoldus Jaske |
| Arnoldus Jaske | |
| G: | aug 1868 |
| Den Haag | |
| O: | 17 sep 1868 |
| Rotterdam | |
| Onbekend |