| Name | Role | Place | Source | |
|---|---|---|---|---|
| Gert Backer | Father | 1771 | Twisk | Birth registration |
| Gert Backer | Father | 1769 | Twisk | Birth registration |
| Gert Backer | Father | 1699 | Wormer | Church records baptisms |
| Gert Backer | Child | 1687 | Leiden | |
| Gert Backer | Father | 1687 | Leiden | |
| Gert Dircx Backer | Deceased | 1612 | Alkmaar | Church records burials |
| Gert Eerken Backer | Registered | 1833 | Amsterdam | Population register |
| Gert de Backer | Father | 1708 | Barsingerhorn | Church records baptisms |
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