Isaac de Vries was a son of Manus de Vries and Clara Bilderbeek. He married 9 February 1910 in Amsterdam Clara Visser, a daughter of Israël Visser and Judik Stibbe. The couple had two children, namely Emanuel in 1910 and Judic in 1921.
Isaac de Vries was vendor by profession and traded in among others haberdasheries and cloth. After their marriage, the lived in Amsterdam at Keizerstraat, Dijkstra…