Britta Marie Ekman was my aunt. I didn't even know she was a twin. I visited my parents and we found a letter referring to Marie's sister as Augusta Marengo. She was still living in 1991 (when Aunt Marie died) but she died sometime before my Uncle Dick (July 1999). I found "Augusta E. Marengo" (born in 1910) in the SSDI. The listing said she died in 1998 in Hennepin, MN. Hope this helps.