I don't know if anyone in your family is interested in genealogy, but I have acquired some information on the family of Augusta Broetsmann Matthis as a result of some research I've done on my own Voigt family. Johanna Gauger Voigt was the half-sister of Augusta Matthis. I have found information on this family back a couple of more generations in Germany.
In Johanna Voigt's obituary from 1927 it states: "Besides her immediate family, she is survived by two sisters, one at Fenton and one at Threeforks, Mont., and one brother in Canada." The sisters were Augusta Matthis and Albertina Schendel, who lived in Iowa until her death in 1956. I have never found the brother in Canada, but based on family naming patterns, his name was likely Friedrich. The spelling of Broetsmann is done a number of ways, the most common in the German records was Broitzmann, and in the US I have found a lot of variations. If anyone is interested, please have them contact me at:
sweaneyd@aol.com

Don Sweaney
Springfield MO