| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Hindrix Uldrix | Father | 1731 | Winschoten | Church records baptisms |
| Jan Uldrix | Registered | 1634 | Amsterdam | Notarial records |
| Jan Uldrix | Father | 1682 | Amsterdam | Church records baptisms |
| Jan Uldrix | Father | 1708 | Hollum | Church records baptisms |
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