| 1. Jan Koster |
 |
| G: |
17 jun 1785 |
| te: |
Harlingen, Friesland |
| O: |
|
| te: |
|
|
|
| 4. Lourens Claesen Koster |
 |
| G: |
1723 |
| te: |
Sint Annaparochie |
| H: |
15 mei 1746 |
| te: |
Harlingen, Friesland |
| O: |
10 feb 1791 |
| te: |
Harlingen |
|
| 8. Claas Lourens Koster |
=> |
 |
| G: |
1696 |
| te: |
Sint Annaparochie |
| H: |
24 mei 1722 |
| te: |
St Annaparochie |
| O: |
ca. 1752 |
| te: |
Harlingen, Friesland |
|