Joseph is een zoon van Meijer Polak en Julia Frankenhuis. Hij trouwde 11 december 1901 met Aaltje Bartels (A'dam, 20 juni 1875).
Bron SAA archiefkaart Joseph Polak 18-7-1876
Joseph Polak and Aaltje Bartels were the parents of Simon and another son. In the literary magazine De Parelduiker (nr. 5, 2007) an article was published on, among others, this family.
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