Jesaia Kooker was a son of Barend Kooker and Eva Wolf. He married 16 August 1917 in Amsterdam to Marianne Vieijra, a daughter of Jacob Vieijra and Margaretha Monnikendam. website www.wiewaswie.nl.
In addition, a Jokos file (number 40736) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.