Leentje Kaanis, born on 2 June 1886 in Rotterdam, was a daughter of Jacob Kaanis and Betje Aandagt. At the age of 20 she married on 17 October 1906 in Rotterdam the 26-year-old Joseph Mok from Amsterdam, a son of Isaac Aron Mok and Jeannette Natkiel. The couple Mok-Kaanis had five children, namely Isaac Aron in 1907, Betje in 1908 - she passed away in 1925 in Amsterdam and was interred at the Jewi…