| Johannes Franciscus Koch | 
| Johannes Franciscus Koch | |
| G: | 3 dec 1837 | 
| Groningen | |
| O: | 14 mrt 1918 | 
| Groningen | |
| Johanna Verhagen | 
| Johanna Verhagen | |
| G: | 3 sep 1843 | 
| Norg | |
| H: | 1 okt 1868 | 
| Groningen | |
| O: | 14 jun 1891 | 
| Groningen | |
| Dorothea Josephine Louise Maijbaum | 
| Dorothea Josephine Louise Maijbaum | |
| G: | 3 mrt 1850 | 
| Hildesheim, Duitsland | |
| H: | 23 okt 1902 | 
| Groningen | |
| O: | 27 apr 1924 | 
| Groningen | |