Otto Fleck was married to Evelina Sopie Fürth. The couple lived at 5 Korverlaan in Bussum.
Amsterdam municipal archive, Records Jokos, Möbel-claim 34989; property Joods Maatschappelijk WerkAmsterdam municipal archive, Records Jokos, Möbel-claim 34989; property Joods Maatschappelijk Werk
In addition, a Jokos file (number 34989) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.