| Name | Role | Place | Source | |
|---|---|---|---|---|
| Frederic Theodore Isenberg | Father | 1888 | Liège | Civil registration births |
| Frederic Theodore Isenberg | Father | 1888 | Liège | Civil registration births |
| Frederic Théodore Isenberg | Father | 1881 | Liège | Civil registration births |
| Frederic Théodore Isenberg | Father | 1881 | Liège | Civil registration births |
| Fréderic Theodore Isenberg | Father | 1883 | Liège | Civil registration births |
| Fréderic Théodore Isenberg | Father | 1886 | Liège | Civil registration births |
| Fréderic Théodore Isenberg | Father | 1888 | Liège | Civil registration deaths |
| Fréderic Théodore Isenberg | Father | 1886 | Liège | Civil registration births |
| Frédéric Théodore Isenberg | Registered | 1880 | Brussel | Alien files |
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