| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Sybren Postma | Child | 1888 | Leeuwarden | Civil registration births |
| Jan Sybren Postma | Groom | 1915 | Leeuwarden | Civil registration marriages |
| Sybren Jan Postma | Registered | 1916 | Amsterdam | Comportement books |
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