| Name | Role | Place | Source | |
|---|---|---|---|---|
| Heerko Anne Groefsema | Father | 1956 | Grootegast | Civil registration deaths |
| Heerko Anne Groefsema | Child | 1920 | Niehove | Civil registration births |
| Heerko Groefsema | Groom | 1939 | Groningen | Civil registration marriages |
| Heerko Groefsema | Child | 1912 | Oldehove | Civil registration births |
| Heerko Groefsema | Registered | 's-Gravenhage, Oldehove, Groningen | CABR dossiers |
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