Emma and Emil were first cousins once removed. Emma's parents were second cousins: four of her eight great grandparents were Gassmann siblings.
Yad Vashem lists an Emma Epstein, born Emma Apt in Gross Strehlitz on 29/08/1871. She was transported on 11/08/1942 from Berlin to Theresienstadt where she died on 19/08/1942.
Kaethe Danziger (geb. Halberstaedter)’s "Bertha Gassmann" notes;
yadvashem.org, yadvashem.org, yadvashem.org - Yad Vashem records;
This record was last updated on 26/01/2019 at 23:42