Jacobus da Costa da Fonseca and Jansje Kapper married in 1905. They had a child.
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Jacobus da Costa da Fonseca and Jansje Kapper were deported from Mechelen with transport XX from 19 April 1943 to Auschwitz.
S. Klarsfeld en M. Steinberg, Memoriaal van de deportatie der Joden uit België (Brussel 1982)