| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jacob Marcus Posthuma | Defendant | 1845 | Leeuwarden | Rollbooks district courts |
| Jacob Marcus Posthuma | Relation | 1907 | Anjum | Civil registration deaths |
| Jacob Marcus Posthuma | Father | 1909 | Jouswier | Civil registration deaths |
| Jacob Marcus Posthuma | Father of groom | 1883 | Oostdongeradeel | Civil registration marriages |
| Jacob Marcus Posthuma | Father | 1857 | Oostdongeradeel | Civil registration births |
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