Jacob Lap, born 12 June 1898 in Amsterdam, was a son of Marcus Lap and Debora Juda and besides working as diamond worker, he was also an office clerk by profession. On 6 January 1927 he married in Amsterdam Marianne Waterman, born 3 July 1899 in Amsterdam as daughter of Levie Waterman and Leentje Speijer. After his wedding in 1927 the Lap-Waterman couple lived at Tolstraat 97 2nd storey in Amsterd…