Izaak Richter and Sara Manheim had three children: Nico Max and two children who survived the war. One of the surviving children had fled abroad a few months before the outbreak of the war in the Netherlands. Nico Max resided at another address. Three letters remain that Izaak Richter wrote from Westerbork, as well as a number of postcards.
Jewish Historical Museum, Documents collection, inv.nr 58…