1851 -
 | Geertruida Koster 1904- |
| Geertruida Koster | |
| G: | 1904 |
| Groningen | |
| Reinder Fruitema 1898- |
| Reinder Fruitema | |
| G: | 3 sep 1898 |
| Oude Pekela | |
| H: | 22 jul 1926 |
| Groningen | |
| Samuel Koster 1876-1918 |
| Samuel Koster | |
| G: | 1 nov 1876 |
| Ruischerbrug, Groningen | |
| O: | 31 okt 1918 |
| Dennenoord, Drenthe | |
| Grietje Post 1879-1953 |
| Grietje Post | |
| G: | 26 nov 1879 |
| Ten Post | |
| H: | 20 okt 1901 |
| Groningen | |
| O: | 20 apr 1953 |
| Groningen | |
|
| Feiko Koster 1851- |
| Feiko Koster | |
| G: | 17 jun 1851 |
| Hoogezand | |
| Meike Meihuizen 1853- |
| Meike Meihuizen | |
| G: | 1853 |
| Martenshoek | |
| H: | 15 mei 1875 |
| Hoogezand | |
