Rachel Grootkerk was the daughter of Isaäc Grootkerk and Aaltje Blog. Together with her husband, Isaac Bonewit, she ran a boarding house, named Beis Jisroeil . This boarding house was a Jewish branche of 'Ons Huis'.
Amsterdam Municipal Archives; record card of Rachel Grootkerk
In addition, a Jokos file (number 5407) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.