| Name | Role | Place | Source | |
|---|---|---|---|---|
| Louis Derdin | Witness | 1863 | Sint-Jans-Molenbeek | Civil registration marriages |
| Louis Derdin | Witness | 1862 | Brussel | Civil registration marriages |
| Pierre Louis Derdin | Father of groom | 1897 | Heverlee | Civil registration marriages |
| Pierre Louis Derdin | Grootouder | 1907 | Heverlee | Civil registration births |
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