| Name | Role | Place | Source | |
|---|---|---|---|---|
| Louis Joseph Triangle | Child | 1879 | Leuven | Civil registration births |
| Louis Joseph Triangle | Groom | 1908 | Leuven | Civil registration marriages |
| Louis Joseph Triangle | Father | 1916 | Heverlee | Civil registration births |
| Louis Joseph Triangle | Witness | 1917 | Heverlee | Civil registration marriages |
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