| Name | Role | Place | Source | |
|---|---|---|---|---|
| Alexandre Decuyper | Witness | 1904 | Brussel | Civil registration marriages |
| Alexandre Decuyper | Witness | 1903 | Brussel | Civil registration marriages |
| Alexandre Decuyper | Witness | 1894 | Brussel | Civil registration marriages |
| Alexandre Jean Decuyper | Relation | Brussel | Alien files | |
| Alexandre Joseph Decuyper | Registered | Brussel | Alien files | |
| Gustave Alexandre Decuyper | Groom | 1904 | Bever | Civil registration marriages |
| Henri Alexandre Decuyper | Father of groom | 1909 | Brussel | Civil registration marriages |
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