Joseph Lampetje was a son of Barend Lampetje and Naatje Brilleman. He married in Amsaterdam on 3 June 1936 to Hendrika Piller. City Archive of Amsterdam, archive card of Joseph Lampetje.
In addition, a Jokos file (number 32863) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.