I sent a message to my Larson friends in Washburn. Their grandfather is from Sweden - Not Norway. In 1957, her father bought the house at 524 West Third Street from your Larsen family. So when I was there, it was a Swedish Larson family, not your Larsen family.
Lars and Gundine is the wrong family. The correct person is Louis H. Larsen, married to Lena/Lina/Oline Taraldson.
This Louis and Lena are buried in the same grave with Lars (Olsen) Larson and Kari.
Nels, Ole and Lars all use "H." in their name. I think this is from the farm "Hvilvang" in Støren, where they were born.