Robert Moritz Weil was the brother of Marianne Weil. He was the grandson of Hanna Elk-Ewy.
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On 4 May 1932, the association 'Ezer Jatom' opened a Jewish orphanage in the Pletterijstraat 66 in The Hague. On 6 March 1943, the Nazis collected the children and staff from the orphanage. Among them were many young German refugees, like Robert Moritz Israel Weil.