Hartog Mansfeldt was married to Jeanette Rozendaal. The couple had at least three children: Hartog, Bertha and Gezina. When Hartog Mansfeldt was a widower he lived with his daughter Gezina.
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Hertog Mansfeldt died on 10 May 1943 in Westerbork transit camp and he was cremated on 12 May 1943. The urn with his ashes was placed on the Jewish cemetry in Diemen on field U, row 6, grave nr. 9.
Register van joden die in het kamp Westerbork zijn gecremeerd, 1943-1944; archief van de gemeente Westerbork, opgenomen in het archief van de gemeente Midden-Drenthe te Beilen, inv. n 3789
Lijst van in de concentratiekampen Westerbork en Buchenwald overleden Joodsche Personen die op Nederlandsche begraafplaatsen ter aarde werden besteld; NIOD, archief Westerbork, port. 1, map 1