This is the Nelson family headstone in Dalton, Minnesota, showing the dates of birth and death of Siri Halvorson's parents, Lars and Johanna (nee Sagmoen).
Thanks again to Julie Schroeder for sending this fine picture along. They just don't take family photos like this anymore. Too bad. Everyone must've been practicing their sober expressions just prior to the picture being taken.
I'm guessing Keith is about six years old in the picture, so I'm guessing it was taken about 1940. I'll update the post when I get confirmation on that.
This is a picture of the Nelson girls, circa about 1899. From left to right: Inger, Siri, Anna Petrina, Seriena, Kari, and Lisa. Not pictures is Lena Josephine, who did not come along until 1900.