| 1. Jan Korteweg |
 |
| B: |
20 Mar 1856 |
| P: |
Ooltgensplaat, Zuid-Holland, Netherlands |
| D: |
13 Jun 1944 |
| P: |
Barneveld, Gelderland, Netherlands |
|
| 2. Dirk Korteweg |
 |
| B: |
1821 |
| P: |
Ooltgensplaat, Zuid-Holland, Netherlands |
| M: |
31 Dec 1847 |
| P: |
Ooltgensplaat, Zuid-Holland, Netherlands |
| D: |
9 Jul 1905 |
| P: |
Ooltgensplaat, Zuid-Holland, Netherlands |
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| 128. |
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| 256. |
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| 512. |
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