| 1. Klaas Koster |
 |
| G: |
11 feb 1839 |
| te: |
Franeker |
| O: |
16 mrt 1840 |
| te: |
Franeker |
|
| 2. Lourens Sybes Koster |
 |
| G: |
23 mrt 1789 |
| te: |
Dokkum |
| H: |
8 mei 1825 |
| te: |
Franeker |
| O: |
3 jul 1839 |
| te: |
Franeker |
|
| 4. Sybe Lourens Koster |
 |
| G: |
1763 |
| te: |
Harlingen, Friesland |
| H: |
21 okt 1787 |
| te: |
Dokkum |
| O: |
15 sep 1805 |
| te: |
Dokkum |
|
| 8. Lourens Claesen Koster |
=> |
 |
| G: |
1723 |
| te: |
Sint Annaparochie |
| H: |
15 mei 1746 |
| te: |
Harlingen, Friesland |
| O: |
10 feb 1791 |
| te: |
Harlingen |
|