Sigurbjörg Björnsdóttir was born on August 22, 1827 in N. Múlasýsla. She died in 1895 in Mountain, N. Dakota.
Spouse: Sveinn Þorsteinsson b. April 14, 1815 in N. Múlasýsla. He died of smallpox in Mikley in the fall of 1876. Sigurbjörg was his third wife.
Children: 1. Pálína b. July 22, 1851 2. Katrín Elísabet b. October 21, 1871. Sigurbjörg had 1. Jóhann(es) Vigfússon with Vigfús Guðmundsson 2. Björn Mikaelsson, son of Mikael Gellison 3. Oddur b. July 4, 1868, father not identified. Sveinn had children with his first wife, Ingibjörg Pálsdóttir: 1. Páll b. February 19, 1836, d. same year 2. Una b. March 31, 1837, d. April, 1837. Sveinn also had children with Anna Hallsdóttir, the widow of Jón Jónsson at Hallbjarnarstaðir: 1. Þorsteinn b. November 19, 1860 2. Kristín b. July 29, 1863 3. Stefanía b. January 9, 1865.
Sveinn and Sigurbjörg came west with their children and step-children in 1876 and settled in Mikley the same year, calling their land Borðeyri. Sigurbjörg lived for a number of years with her children in the Fljóts Settlement, but then moved to N. Dakota in 1880 and lived in Pembina. She later moved to Mountain.