Israel Meijer and Frouke de Lange married in 1905 in Zwolle. They had four children. Their son Mozes died in 1917. Besides the here mentioned children they also had a son Joseph.
Stadsarchief Amsterdam, archiefkaart Israel Meijer
In addition, a Jokos file (number 51584) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.The Jokos file reveals that a claim was lodged for compensation for valuables surrendered to the Lippmann-Rosenthal looting bank (L-claim, number 8313/21052).