Jacob van Gelderen was the son of Michel van Gelderen and Frederika Fedder a family with four children: Jacob self, Alfred, Emma and Willem. On 14 June 1915 in Amsterdam Jacob was married to Alexandrina de Vries. She was the daughter of Jacob de Vries and Klaartje Mok. The couple had three children: Margreet, Johan and one child who presumably lived in the Dutch East-Indies during the war.
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