Nathan Blom was a son of Mozes Blom (born 1856) and Sophia van Praag (born 1852). He was a widower of Esther de Wind (1888-1931) and he married in July 1935 in Den Haag to Jaantje Poons. The families of his two (married) sisters Naatje Tokkie-Blom and Kaatje Ossendrijver-Blom, and his brother Maurits Blom (born 1883) were murdered.
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