| Name | Role | Place | Source | |
|---|---|---|---|---|
| Roelf Azing Posthumus | Child | 1879 | Bedum | Civil registration births |
| Roelf Jacobs Posthumus | Deceased | 1851 | Metslawier | Death duties files |
| Roelf Jakobs Posthumus | Seller | 1851 | Oostdongeradeel | Notarial records |
| Roelf Posthumus | Father | 1864 | De Wilp | Civil registration births |
| Roelf Posthumus | Child | 1823 | Noordwijk | Civil registration births |
| Roelf Posthumus | Child | 1924 | Grijpskerk | Civil registration births |
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