| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Pieter Loopstra | Father | 1860 | Duurswoude | Civil registration deaths |
| Pieter Coenraad Jan Loopstra | Registered | 's-Gravenhage, Leeuwarden, Schiermonnikoog | CABR dossiers | |
| Pieter Coenraad Jan Loopstra | Registered | 1919 | Leeuwarden | Population register |
| Pieter Coenraad Jan Loopstra | Registered | 1919 | Leeuwarden | Population register |
| Pieter Coenraad Jan Loopstra | Groom | 1945 | Schiermonnikoog | Civil registration marriages |
| Pieter Coenraad Jan Loopstra | Child | 1919 | Leeuwarden | Civil registration births |
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