Gezin: Ing. Willem Sybrand VAN HEEMSKERCK DÜKER / Maria Adriana BULK (F136)
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)
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