Tofterå Slettemoen genealogy
Family: Jan Gerytsz van Steenvoorden (F6136)
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 | Gerrit Janszn van Steenvoorden (1290-1355)
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 | Catharina van Leijden (1330- ) |
| Jan Gerytsz van Steenvoorden (1330-1415)
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| Gerrit Jansz van Steenvoorden (1355-1449)  |