Nathan Polak was the eldest of the six children of Levie Frank and Henderina Cohen. He was born on 16 May 1899 in Rotterdam and married there on 30 October 1929 Betje de Leeuw from Hoogeveen, born there on 10 August 1901 as daughter of Salomon de Leeuw and Klara Brest. Nathan Frank and Betje de Leeuw had no children.
Betje de Leeuw arrived from Hoogeveen in Rotterdam already on 13 May 1924, were s…