Katilie Seligsberger was the daughter of Salomon Seligsberger and Bertha Wijnbergen. She was married to Salomon Frenkel, who died in 1928. The couple had three children, among whom 536017. The two other children survived the war.
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In February 1942, an obituary was placed in Het Joodsche Weekblad for Katilie Frenkel-Seligsberger.
Het Joodsche Weekblad, 6 February 1942, 8
The funeral records at the Jewish cemetery in Haarlem reveal that Katilie Seligsberger was buried there.
In addition, a Jokos file (number 16345) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.