Izaäk Oudkerk was the 2nd of the 14 children of Emanuel Hijman Oudkerk and Jegeva Sloog. He was born on 12 November 1878 in Den Helder and worked as a warehouse clerk. On 29 July 1909, Izaäk married in Zaandam Aaltje Nijstat, who was born in Zwolle. She was born there on 15 June 1873, a daughter of Joel Nijstat and Rika Davidson.
Before Izaäk married Aaltje Nijstat, he already lived in Amsterdam a…