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In page L. L. Zamenhof:

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Zamenhof and his wife Klara Silbernik raised three children, a son, Adam, and two daughters, Zofia and Lidia. Lidia, in particular, took a keen interest in Esperanto, and as an adult became a teacher of the language, travelling through Europe and to America to teach classes in it. Through her friendship with Martha Root, Lidia became a member of the Baháʼí Faith. As one of its social principles, the Baháʼí Faith teaches that an auxiliary world language should be selected by the representatives of all the world's nations.[citation needed] All three of Zamenhof's children were murdered by the Nazis during the Holocaust.[1]