Hartog Nathan Bonnewits was a son of Nathan Hartog Bonnewits and Matje Fruitman. In 1905 he got married to Henriette Frenkel, a daughter of Benjamin Frenkel and Henrietta Koster. From this marriage one child was born. After Henriette Frenkel had passed away Hartog Nathan Bonnewits got married to Amalia Drukker.
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The funeral records at the Jewish cemetery in Rotterdam reveal that Hartog Bonnewits was buried there.