Hartog Frankfort was a son of Jacob Frankfort and Rebecca Vogel. He married 20 May 1931 in Amsterdam to Rozette van Loggem, a daugther of Jonas van Loggem and Saartje Walg.
Stadsarchief Amsterdam, archiefkaart Rebecca Vogel and website www.wiewaswie.nl.
In addition, a Jokos file (number 40485) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.