| Name | Role | Place | Source | |
|---|---|---|---|---|
| Rieuwert Iebes Poortinga | Father | 1887 | Oostdongeradeel | Civil registration births |
| Rieuwert Poortinga | Mention | 1889 | Oostdongeradeel | Notarial records |
| Rieuwert Poortinga | Conscript | 1877 | Militia records | |
| Rieuwert Poortinga | Groom | 1878 | Westdongeradeel, Ternaard | Civil registration marriages |
| Rieuwert Poortinga | Child | 1857 | Westdongeradeel | Civil registration births |
| Rieuwert YBES Poortinga | Mention | 1857 | Emigration Registers | |
| Rieuwert Ybes Poortinga | Mention | 1888 | Menaldumadeel | Notarial records |
| Rieuwert Ybes Poortinga | Father | 1885 | Dantumadeel | Civil registration births |
| Rieuwert Ybes Poortinga | Father | 1878 | Westdongeradeel | Civil registration births |
| Rieuwert Ybes Poortinga | Father | 1881 | Dantumadeel | Civil registration births |
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