Duifje van der Sluis was a daughter of Enoch van der Sluis and Hester van Wittene. She was married in Rotterdam on 30 March 1910 to Levie van Dam, a son of Herman van Dam and Alida Cohen. Duifje and Levie had eleven children together. Four of them have died at a very young age. According to data from his family registration card, her son Herman presumably have fallen in action in Spain in the 1930…