Izaäk van Dam was married to Eva Nathans. The couple had three sons, Martijn Bertus, Siemon Machiel and Bernard Max. They owned a textile goods shop at 42 Stationsweg in Zuidlaren. The two eldest sons, Martijn Bertus and Siemon Machiel, worked in the shop and peddled textiles to farmers. Betje Polak from Sleen worked in the shop as a saleswoman.
Izaäk van Dam was chairman of the shopkeepers' ass…