Gertrud Margaretha (Greta) Rindskopf was the widow of Albert Warburg. The couple had three children: Helene Julie (Ellen), Betty and one child that survived the war.
Gertrude Margaretha Warburg-Rindskopf was deported to Sobibor together with her daughter Betty.
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For additional information, see:
G. Wenzel-Burchard, Granny: Gerta Warburg und die ihren Hamburger Schicksale berichtet von Gertrud Wenzel-Burchard (Hamburg 1970).
More information on the Warburg family can be found on the website of the Universität Hamburg.