Simon Grootkerk was married to Hanna Zeldenrust. The couple was registered at the Burmanstraat 37 II in Amsterdam in 1941, but also lived in the Grevelingenstraat in Amsterdam.
Amsterdam municipal archive, Records Jokos, Möbel-claim 52937, statement of the right to inheritance d.d. 1-9-1964; property Joods Maatschappelijk Werk
In addition, a Jokos file (number 52937) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.