Esther Oudkerk was a daughter of Meijer Gerrit Oudkerk who passed away in 1935 and Dina van Praag. She married in Amsterdam on 16 June 1925 to Aron Salomons. Website wiewaswie.
In addition, a Jokos file (number 51176) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.