Cornelis Koster (1864-1927) 
|
Anna Geertruida Hendriks (1865- ) |
Anna Geertruida Koster (1895- )  |
| Cornelis Koster (1896-1897) |
| Hendrika Cornelia Koster (1900-1903) |
| Albertus Adrianus Koster (1902- ) |
| Cornelis Postma (1895- ) |
| Margaretha Johanna Koster (1897- )
|
