| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johan Herman Hamringa | Child | 1920 | Groningen | Civil registration births |
| Johan Herman Hamringa | Registered | 1920 | Amsterdam | Police reports |
| Johan Herman Hamringa | Groom | 1947 | Groningen | Civil registration marriages |
| Johan Herman Hamringa | Groom | 1942 | Groningen | Civil registration marriages |
| Johan Herman Hamringa | Father | 1944 | Groningen | Civil registration deaths |
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