Broentje Kolthoff was a daughter of Isaac Kolthoff and Florette van Essen. She was married in Groningen on 1 August 1898 to Eliazar de Leeuw. Her husband passed away in Arnhem in 1928.
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In June 1941, an obituary was placed in Het Joodsche Weekblad for B. de Leeuw-Kolthoff. She had been 'Director for many years of the Jewish Old People's home in Arnhem'.
Het Joodsche Weekblad, 13 June 1941, 11
The funeral records at the Jewish cemetery in Arnhem reveal that a memorial stone is placed for Broentje Kolthoff.