Israel Stern was the son of Meijer Stern and Rosette Stern. He married Marie de Vries, daughter of Joseph de Vries and Heintje Wijnberg. The couple had at least one son, Meijer.
Amoetat Akevoth, Dutch Jewish Genealogical Data Base
In addition, a Jokos file (number 796) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.