| Name | Role | Place | Source | |
|---|---|---|---|---|
| Johan Jacob Alt | Father | 1788 | Rotterdam | Church records baptisms |
| Johan Jacob Alt | Groom | 1786 | Rotterdam | Church records marriages |
| Johan Jacob Alt | Child | 1717 | Nijmegen | Church records baptisms |
| Johan Jacob Alt | Father | 1717 | Nijmegen | Church records baptisms |
| Johan Jacob Alt | Father | 1707 | Nijmegen | Church records baptisms |
| Johan Jacob Alt | Father | 1714 | Nijmegen | Church records baptisms |
| Johan Jacob Alt | handelt voor zich | 1749 | Schepenprotocollen | |
| Johan Jacob Alt | Father | 1712 | Nijmegen | Church records baptisms |
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