Hartog van de Kar was married to Anna de Jong. This marriage ended in divorce on 7 September 1939. The couple had eleven children. Hartog van de Kar then married Anna Nabarro. The couple lived at 10 Goudsedwarsstraat in Rotterdam. Salomon van de Kar from Hartog's first marriage also lived at this address.
Hartog van de Kar was taken to Westerbork, where two rings were stolen from him.
The archive of the Stichting Sieraden-Comité contains a list of the stolen items of jewelry and a statement of the right to inheritance from 1959.
NIOD, Records Stichting Sieraden-Comité, box HF 15, file 211
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