Grietje Polak married 5 August 1942 in Amsterdam to Louis van Gelderen, a son of Abraham van Gelderen and Mietje Zilverberg.
City Archive of Amsterdam, archive card of Abraham van Gelderen and Grietje Polak .
According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, this family had a greengrocery, address: Kerkstraat 370 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives