| Name | Role | Place | Source | |
|---|---|---|---|---|
| Sioerd Sioerdts | Father | 1664 | Dokkum | Church records baptisms |
| Sioerd Sioerdts | Lidmaat | 1636 | Leeuwarderadeel | DTB Lidmaten |
| Sioerd Sioerdts | Mention | 1632 | Tietjerksteradeel | Mortgage books |
| Sioerd Sioerdts Potter | Curator ad actum divisionis | 1661 | Dokkum | Nedergerechten |
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