| Name | Role | Place | Source | |
|---|---|---|---|---|
| Lubbert Jan Groothof | Groom | 1932 | Ten Boer | Civil registration marriages |
| Lubbert Jan Groothof | Father | 1945 | Loppersum | Civil registration deaths |
| Lubbert Jan Groothof | Father | 1933 | Uitwierde | Civil registration deaths |
| Lubbert Jan Groothof | Father | 1945 | Loppersum | Civil registration deaths |
| Lubbert Jan Groothof | Child | 1904 | Delfzijl | Civil registration births |
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