Clara Frederica Sohn was a daughter of Michael Sohn and Josephine Ochs (or Ochse). She married 9 April 1891 in Rotterdam Maurits Wolfsbergen, a son of Salomon Wolfsbergen and Rozetta Zangers. The couple had three children, who have survived the war.
City Archive of Rotterdam, index births and deaths and Municipal Archive of Den Haag, Digital Family tree.