Zamenhof's father, Mark Zamenhof (1837-1907), taught french and german in various schools. Rozalia Zamenhof (1839-1892), the mother of Ludwik, was a housewife. Ludwik Zamenhof and his wife Klara (1863-1924) had three children. The son, Adam (1888-1940), was head-doctor of the eye pavillion of a jewish hospital in Warsaw, whose son Louis-Christophe Zaleski-Zamenhof (1925), doctor engineer of on and off shore construction, is also an esperantist. The oldest daughter of Ludwik Zamenhof, Zofia (1904-1942), was a child-doctor of internal diseases in Warsaw. She kept helping her father with arranging his vast library. Lidia Zamenhof (1904-1942), the second daughter, was a keen promoter of both Esperanto and Humanitarianism. All of Ludwik's children died because of the Nazi regime.
Ludwik Zamenhof had eight siblings. His sister Sara (1860-1870) was the second child of the family, but she died at the age of 10 and because of that the oldest of his siblings were Fania (1862-1930s) and Augusta (1864- before 1934). His brother Felix (1868-1933) was a pharmacist. Henryk (1871-1932) was a doctor, although he spoke Esperanto he did not concern himself much in terms of the language and the movement. Leon (1875-1934) was a doctor of throat, ear and nose diseases and became an esperantist as of 1898. Alexander (1877-1916), who died as a colonel of the russian army in Dvinsk, was a doctor, the youngest son and the most loved brother of Ludwik Zamenhof. He was an esperantist from the the very beginning. Ida (1879-1942) was the youngest sister of Ludwik. She was also an esperantist.
You will find more photos of the Zamenhof family at Photogallery