Not sure if you ever got an answer but Ada Malstrom died 2 December 1972 and is buried with Carl in Pelican Rapids in the Zion Lutheran church. Carl was her 2nd husband after Byron Martin. Nannie is also buried in Pelican Rapids with Edmund. Find-a-grave https://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=3...
had more family information.