Theresa was born in 1850. She passed away in 1897.
Sources
https://books.google.ca/books?id=8Ma-JtWs3mkC&dq=alois+mengele+1917&hl=fr&source=gbs_navlinks_s In the Matter of Josef Mengele: A Report to the Attorney General of the United States, United States. Department of Justice. Office of Special Investigations, Vol 2; Neal M. Sher, Eli M. Rosenbaum, United States. Department of Justice. Office of Special Investigations, United States. Department of Justice. Criminal Division; Published by U.S. Department of Justice, Criminal Division, 1992; Harvard University. Digitized 14 Nov 2019. Citing: Ancestor table and SS heriditary soundness form for Josef Mengele, pg 49-56. Listing parents, paternal and maternal grandparents, and great-grandparents.
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