Isaac van der Glas was a son of Jochem van der Glas and Elsje Bonnewit. He married 22 May 1919 in Amsterdam the non-Jewish Maria Johanna Eduardina Heick from Hamburg, a daughter of Christian Peter Heick and Hanne Marie Hansen. The couple had no children.
Isaac van der Glas, also known as Sjaak, lived at Kerkstraat 330 II in Amsterdam and worked as pianist among others at the Tuschinsky film theat…