Rachel Polak was a daughter of Emanuel Polak and Clara Lek. She married Simon Betel in Amsterdam on 7 June 1933, a son of Isaac Betel and Betje Piller.
City Archive of Amsterdam, archive card of Emanuel Polak and Simon Betel.
This person is commemorated on a memorial in Vierhouten. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.