| Name | Role | Place | Source | |
|---|---|---|---|---|
| Sybe Douwes Poelstra | Plaatsvervanger | 1827 | Leeuwarden | Notarial records |
| Sybe Lammerts Poelstra | Deceased | 1853 | Akkerwoude | Death duties files |
| Sybe Lammerts Poelstra | Groom | 1853 | Dantumadeel, Bergum | Civil registration marriages |
| Sybe Lammerts Poelstra | Deceased | 1853 | Akkerwoude | Civil registration deaths |
| Sybe Poelstra | Child | 1825 | Tietjerksteradeel | Civil registration births |
| Sybe Poelstra Sevenster | Mention | 1828 | Emigration Registers |
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