| Name | Role | Place | Source | |
|---|---|---|---|---|
| Alida Joh de Backer | Registered | 1877 | Oisterwijk | Population register |
| Hendrik Joh de Backer | Registered | 1878 | Oisterwijk | Population register |
| Henricus Joh de Backer | Registered | 1878 | Oisterwijk | Population register |
| Joh. Backer | Registered | 1756 | Amsterdam | Notarial records |
| Joh. Backer | Registered | 1709 | Amsterdam | Notarial records |
| Joh. Marten Backer | Father | 1758 | Arnhem | Church records baptisms |
| Maria Catharina Joh. de Backer | Deceased | 1936 | Bergen op Zoom | Doodsoorzaken |
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