Mozes Grootkerk and Sara Calo married in 1893 in Amsterdam. They had nine children. Three of them, Jacob, Grietje and Grietje, died at a young age. Other children were Betje and Aäron.
Stadsarchief Amsterdam, archiefkaart Mozes Grootkerk
In addition, a Jokos file (number 18598) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.