Saartje van Allemans was a daughter of Jonas van Allemans and Reintje van Allemans-Cohen. She married in Amsterdam on 21 September 1922 to Benjamin Levie de Leeuw. Genlias.
In addition, a Jokos file (number 9079) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.