Esther Nikkelsberg was married on 26 February 1941 in Amsterdam to Andries van Os, a son of Joseph van Os and Vogelina de Rosa.
Together they had a daughter named Vogelina van Os.
NIOD, Archief Stichting Sieraden-Comité, doos HF 15, dossier 225 and City Archive of Amsterdam, archive card of Joseph van Os.