Family Group Sheet| FATHER | | Joost van Kerkhof | | REF # | | 17164; | | | | MOTHER | | Ulberthe Wielenga | | BIRTH | 19 December 1967 | Leiden | | REF # | | 17163; | | FATHER | Marten Wielenga | | MOTHER | Hendrikje Koopen |
| | | CHILDREN | | 1. | Sjoerd Johannes van Kerkhof MALE | | | BIRTH | 6 July 2000 | Gouda | | REF # | | 17165; |
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