My great-great-grandmother, Adelheid Marx was a descendant of the Marx rabbinic family from western Germany. Her husband was Albert Westheim (d c. 1915) and her children include my great-grandmother, Elsa Mühlgay (née Westheim [unknown-1981]) and son/step-son, Paul Westheim.
We think that this Marx family is the same as Karl's for what it's worth.
Family stories and family records provide two conflicting death dates of c.1920 and 1945 and disagree on the place.
How can I identify the parents of Adelhaid Marx?