Izaak Cohen (known as Chi) was the son of Hartog Cohen (known as Herman) and Rebekka van Essen. His father was an estate agent and appraiser in Deventer. He had four brothers and one sister. The Cohen children belonged to the Zionist movement when they were in their twenties. Chi and his brother Ru played a leading role in the Vereniging tot Vakopleiding van Palestinapioniers (Association for the …