| Name | Role | Place | Source | |
|---|---|---|---|---|
| Constant Clément Pierson>Allaerts | Gewettigd kind | 1913 | Leuven | Civil registration marriages |
| Constant Pierson | Father of bride | 1903 | Gros-Fays | Civil registration marriages |
| Constant Pierson | Father of bride | 1903 | Gros-Fays | Civil registration marriages |
| Constant Pierson | Father of groom | 1889 | Bande | Civil registration marriages |
| Jean Rene Constant Pierson | Deceased | 1981 | Bioncourt | Civil registration deaths |
| Jean Rene Constant Pierson | Deceased | 1981 | Bioncourt | Civil registration deaths |
| Raymond Constant Pierson | Deceased | 1974 | Bar-le-Duc | Civil registration deaths |
| Raymond Constant Pierson | Deceased | 1979 | Remiremont | Civil registration deaths |
| Raymond Constant Pierson | Deceased | 1979 | Remiremont | Civil registration deaths |
| Raymond Constant Pierson | Deceased | 1974 | Bar-le-Duc | Civil registration deaths |
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