| Name | Role | Place | Source | |
|---|---|---|---|---|
| Sybren Simons Algra | Owner | 1832 | Hardegarijp | Cadastre |
| Sybren Simons Algra | Seller and buyer | 1912 | Idaarderadeel | Notarial records |
| Sybren Simons Algra | Voter | Tietjerksteradeel | Registres Civiques | |
| Sybren Simons Algra | Mention | 1912 | Idaarderadeel | Notarial records |
| Sybren Simons Algra | Mention | 1912 | Idaarderadeel | Notarial records |
| Sybren Simons Algra | Father | 1872 | Smallingerland | Civil registration deaths |
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