| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jenko Freerk Groenhagen | Child | 1922 | Oterdum | Civil registration births |
| Jenko Groenhagen | Child | 1851 | Termunten | Civil registration births |
| Jenko Groenhagen | Father | 1872 | Oude Pekela | Civil registration deaths |
| Jenko Groenhagen | Father | 1916 | Delfzijl | Civil registration deaths |
| Jenko Groenhagen | Groom | 1909 | Termunten | Civil registration marriages |
| Jenko Groenhagen | Father | 1881 | Oterdum | Civil registration births |
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