|  | Cornelis Koster  (1872-1962)   | 
|  | Johanna de Wit  (1876-1962)   | 
|  | Cornelia Hendrika Jacoba Koster  (1901- ) | 
|  | Jacoba Gijsberta Koster  (1903- ) | 
|  | Hendrikus Cornelis Koster  (1904-1904) | 
|  | Hendrika Johanna Koster  (1905- )  | 
|  | Cornelis Johannes Koster  (1907-1992) | 
|  | Johanna Cornelia Koster  (1908- ) | 
|  | Jacob Hendrikus Cornelis Koster  (1909- ) | 
|  | Catharina Maria Koster  (1910- ) | 
|  | Helena Maria Koster  (1915- ) | 
|  | Wouter Elisa Josephus Steenhoff  (1900-1993)   | 
|  | Maria Jacoba Koster  (1899-1981)   | 
|  | Therese Marie Angele Agathe Steenhoff  (1925-2012) | 
|  | Paul Joanna Hermann Steenhoff  (1936-2015) | 
|  | Petrus Joannes Willibrordus Steenhoff  (1937-1967) | 
|  | Levenloos zoontje van Wouter Steenhoff  (1944-1944) |