Lion de Rooy and Leentje de Jager married in 1897 in Amsterdam. They had four children, among whom Esther, Abraham and Jacobus.
Stadsarchief Amsterdam, archiefkaart Lion de Rooy
In addition, a Jokos file (number 13368) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.