Leo Monasch was a son of Levie Eliazar Monasch and Betje Levie Cats. He was married to Betsy Gast, who passed away in 1917.
Addition of a visitor of the website.
This person lived alone or no information about family members is known or traceable.
In addition, a Jokos file (number 18982) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.