Isaäc Roselaar was a son of Joël Philip Roselaar and Saartje Roodfeld. He married Mathilda Klerk in 1883 in Amsterdam. She died in 1939. They had six children, among whom Joseph, Emanuël and Anna.
Stadsarchief Amsterdam, archiefkaart Isaäc Roselaar
On 15 September 1942 Isaäc moved in with his son Joseph on Transvaalplein 20 boven. On 8 March 1943 he moved to Afrikanerplein 11 II.
A. Caransa, Verzamelen op het Transvaalplein. Ter nagedachtenis van het Joodse proletariaat van Amsterdam (Haarlem 1992) 100
In addition, a Jokos file (number 17371) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.