Emanuel Loonstein was a son of Jacob Loonstein and Naatje Speijer. He married 5 February 1920 in Amsterdam to Schoontje Keizer, daughter of Emanuel Keizer and Kaatje van der Beugel. The couple had only one son, Jaap Emanuel.
City Archive of Amsterdam, archive card of Emanuel Loonstein.
Emanuel Loonstein and his family moved within Amsterdam to the Retiefstraat 104 on 3 December 1942.
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