Isaac Hagenaar was the son of Emanuël Hagenaar and Anna Delden.
In 1918 Isaac Hagenaar founded the Oostzaanse woningbouwvereniging (housing association). He was the president. Isaac also was a town councillor for the SDAP in Oostzaan.
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Isaac Hagenaar and Theresia Winnik had seven children: Emanuel, Anna, David, Hartog, Rachel and two children who survived the war.
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In addition, a Jokos file (number 7846) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization f…