Born ‎3-12-1825 Nijmegen, Netherland‎. Son of David Salomon Blok - Davids and Hester Isaak Hertz - Spijer‏

Born ‎18-2-1830 Rotterdam, Netherland‎, ‎1st marriage to: Salomon David Blok - Hertz, ‎2nd marriage to: Isaac Jacob Batavier - Gobetz. Daughter of Salomon Jacob Roos - Engelsman and Elisabeth la Costa - Lavino‏