| Name | Role | Place | Source | |
|---|---|---|---|---|
| Edouard Octave Collart | Groom | 1910 | Elsene | Civil registration marriages |
| Octave Collart | Witness | 1910 | Sint-Jans-Molenbeek | Civil registration marriages |
| Octave Jean Baptiste Joseph Collart | Groom | 1912 | Brussel | Civil registration marriages |
| Roger Helidore Octave Ghislain Collart | Child | 1914 | Kessel-Lo | Civil registration births |
| Théodore Octave Collart | Child | 1868 | Namur | Civil registration births |
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