Mietje van Gelder was a daughter of Leendert Joseph van Gelder and Henderina van Vriesland. She married Levie Smit in Amsterdam on 19 December 1912, a son of Willem Smit and Debora Wagenhuijzen.
Mietje van Gelder was born in a family with ten children; one brother died young, eight years old in 1888…
In addition, a Jokos file (number 16208) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.