| Isaac Moses Willing Slap (1852 - 1919) |
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| Rachel Aaron Sturk Waas (1854 - 1932) |
| Aron Ari Waas Slap | Sara Kesnig |
| b. 24 Aug 1882, Amsterdam, Nord-Holland, Netherlands d. abt 1940 bur. occ. edu. rel. |
b. 1 May 1870, Amsterdam, Nord-Holland, Netherlands d. 21 May 1943, Sobibor Death Camp, Biala Podleska, Poland. bur. occ. edu. rel. |
| Saul 'Sally' Slap Rachel Slap Marianna Slap Jansje Slap Izak Slap |