Hartog de Vries was the only child and son of Leendert de Vries and Rachel Dreese. 22 April 1935 he married in Amsterdam Ruchel Waksman from Sandomierz in Poland, a daughter of Leizor Waksman and Jisko Berman. In 1938 the couple had a daughter named Ida (usually known as Ietje); she survived the Holocaust.
Before Hartog de Vries got married, he lived at home with his parents at St. Antoniebreestra…