Looking specifically for information/confirmation of name of Sivert Peterson's wife. Sivert Peterson was born in Norway in 1853 and immigrated to the US in 1886. He and his existing family at the time settled in Minnehaha County around the same time. My great-grandmother, Rachel (Ragna) Peterson Oas was born in Minnehaha County in 1889. I found a gravestone in Pioneer Cemetery of Sigre Peterson who lived from 1856-1894, which would fit into my great-grandmother's history as her youngest sister and last sibling was born that same year. But I can't find any other records online that confirms my hypothesis. Thanks!