Israël Jacob IJer was a son of Abraham IJer and Kaatje Stad. 5 August 1931 he married in Rotterdam Sophia Droomer, a daughter of Leendert Droomer and Sophia Aandagt. The couple had two children: Kaatje in 1932 and Leendert in 1935. Both children were killed in the Shoah, just as their parents.
After their marriage, Israël Jacob and his wife Sophia have lived in at some different addresses in Rotte…