
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).
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Here is a picture of Tone (Thovsdatter) Halvorson (1852 – 1946), the mother of Henry Halvorson and the daughter of Thov Halvorson and Tone Sorenson (1825 – 1909).
Here is a picture of Roald Halvorson (1843 – 1921), father of Henry Halvorson.  He immigrated to the United States in 1865 with his sister Mary, who was a few years older than he.   He also had an older brother named Halvor.   His father's name was also Halvor (what else could it be).