Karel Louis Leons was the youngest of the two children of Salomon Leons and Dina Selina Wolf. The eldest child was his sister Esther Jeannette, born in 1905, and who was married to Leendert Bleekrode in Den Haag on 22 November 1933. Both have survived the Holocaust. (Leendert's grandfather was Mozes Bleekrode, born 4 July 1862 and died at Camp Westerbork 1 April 1943).
Karel Louis married Elise …