Joseph Backs was the foster son of Philip van Gelder and Elise Cohen. When his prospective in-laws were arrested, he joined them in Westerbork voluntarily.
P. Lurvink, De joodse gemeente in Aalten. Een geschiedenis 1630-1945 (Zutphen 1991) 190
This person is commemorated on a memorial in Aalten. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.
Biography