Achterhoek Ancestors
Family: Arent Jan Koskamp / Arntje (F11870)
m. Abt 1890Derk Jan Koskamp (1833-1909) 
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Hendrika Winkelhorst (1836-1914)
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Tonia Christina Koskamp (1858- )  |
| Gerrit Jan Koskamp (1864- ) |
| Christiaan Koskamp (1867- ) |
| Edward Koskamp (1871- ) |
| John Koskamp (1873-1955) |
| Henry Koskamp (1875-1905) |
| Arent Jan Koskamp (1861-1946)
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| Arntje (1866-1958) |
| Denis Koskamp (1890- ) |
| Jennie Koskamp (1892- ) |
| Sebold Koskamp (1893- ) |
| Hattie Koskamp (1896- ) |
| Aarnt J. Koskamp (1897- ) |