Jochem van Cleef was a son of Meijer van Cleef and Saartje Kloot. He got married to Clara Jas in 1906. She was the daughter of Joël Jas and Rosette Scharlewie. The couple had six children: Joël, Isaac (who died at a young age), Emanuel, Celina and two children who survived the war. After Clara Jas …