| Sjoert Christianus Pieter Schwitters | |
| B: | 1893 |
| Groningen, NLD | |
| Anna Henderika Olthof |
| Anna Henderika Olthof | |
| B: | 7 Aug 1899 |
| Groningen, NLD | |
| M: | 7 Aug 1924 |
| Amsterdam, Noord Holland, NLD | |
| D: | 27 Jun 1971 |
| Arnhem, Gelderland, NLD | |
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