| Name | Role | Place | Source | |
|---|---|---|---|---|
| Elias Samuel Keyzer | Mention | 1818 | Leeuwarden | Notarial records |
| Samuel Izaaks Keyzer | Father | 1767 | Kerkelijke gemeente Groningen | Registrations before 1811 |
| Samuel Keyzer | Witness | 1869 | Brussel | Civil registration marriages |
| Samuel Keyzer | Father of groom | 1853 | Brussel | Civil registration marriages |
| Samuel Keyzer | Witness | 1871 | Brussel | Civil registration marriages |
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