Gezin: Ing. Willem Frederik VAN HEEMSKERCK DÜKER / Ineke SCHÖNFELD (F134)
getr. 25 sep 1937Arnold Johan VAN HEEMSKERCK DÜKER (1878-1932) 
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Cornelia PLIESTER (1876-1938)
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| Ing. Willem Frederik VAN HEEMSKERCK DÜKER (1910-1988)
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| Ineke SCHÖNFELD (1911-1977) |
Ina Yke VAN HEEMSKERCK DÜKER (1941-2013)  |
| Ing. Willem Sybrand VAN HEEMSKERCK DÜKER (1944-2021) |