| Name | Role | Place | Source | |
|---|---|---|---|---|
| Ferdinand De Keyzer | Child | 1917 | Kessel-Lo | Civil registration births |
| Ferdinand Keyzer | Deceased | 1966 | 's-Gravenhage | Civil registration deaths |
| Ferdinand Keyzer | Partner | 1961 | 's-Gravenhage | Civil registration deaths |
| Ferdinand Keyzer | Military | Studbooks | ||
| Henri Adam Ferdinand Keyzer | Registered | Maastricht | Population register | |
| Johan Ferdinand Keyzer | Registered | 1779 | Utrecht | Militia records |
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