Isaac Grootkerk was a son of Mozes Grootkerk and Schoontje Abraham Peperwortel. Isaac Grootkerk married Rebecca de Jong on 28 July 1880. Addition of a visitor of the website
Five children died in the war: Hartog, Sientje, Roosje, Jacob and Grietje. One other child, Jonas, had already died. One child survived the war. Addition of a visitor of the website