| Name | Role | Place | Source | |
|---|---|---|---|---|
| Jan Hubert Mathieu Keulen | Witness | 1931 | Hoensbroek | Civil registration marriages |
| Jan Hubert Mathieu Keulen | Witness | 1931 | Hoensbroek | Civil registration marriages |
| Jan Mathieu Keulen | Deceased | 1991 | Brunssum | Prayer card collection |
| Jan Mathieu Keulen | Widower | 1993 | Brunssum | Prayer card collection |
| Jan Mathieu Keulen | Father | 1945 | Heerlen | Civil registration deaths |
| Jan Mathieu Keulen | Deceased | 1991 | Brunssum | Prayer card collection |
| Jan Mathieu Keulen | Father | 1945 | Heerlen | Civil registration deaths |
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