Hartog de Vries was a son of the broker Mordechai de Vries and Naatje Davids. He married Sophia Adriana Juliette de Boer from Rotterdam on 5 December 1907 in Watergraafsmeer (Amsterdam), a daughter of the musician Henri de Boer and the actress Ester van Rijk. The couple had two children, namely Esther Hanna in 1909 an Martijn Henri in 1913. Their daughter left for Tel Aviv on 25 September 1936 but…