Christiaan Koster (1870-1947) 
|
Rosina Maria Franken (1869-1950) |
Cornelis Koster (1893- )  |
| Thomas Johannes Koster (1894-1894) |
| Christiaan Koster (1897-1940)
|
| Sara Christina Piers (1898- ) |
| Christina Rosina Koster (1917-1928) |
| Wilhelmina Maria Koster (1918-2006) |
