Achterhoek Ancestors
Family: Albertus Willem Oonk / Gerharda Brethouwer (F5663)
 | Jan Gerhard Oonk (1874-1935) 
|
 | Janna Berendina Droppers (1880-1965)
|
 | Janna Oonk (1905-1997)  |
 | Gerrit Jan Oonk (1908-1990) |
| Jan Gesinus Brethouwer (1879- )
|
| Johanna Hendrina Beunk (1883- )
|
| Gerrit Jan Brethouwer (1908-1988) |
 | Albertus Willem Oonk (1912-1996)
|
| Gerharda Brethouwer (1919-2006)
|
