Gísli Pétur Sigurbjörnsson was born on August 4, 1874 in N. Þingeyjarsýsla. He died in Washburn, N. Dakota on January 16, 1908. He took the name Petur Gisli Thorsteinson in the west.
Spouse: Jakobína Ágústa Sigbjörnsdóttir b. August 11, 1876 in N. Múlasýsla.
Children: 1. Rósa Adelina b. March 8, 1896 2. Victor Harry b. September 13, 1897 3. Jóhanna Sigurbjörg b. March 7, 1900 4. Björn Marvin b. February 13, 1902.
Gísli Pétur came west to Minnesota in 1879 with his parents, Sigurbjörn Þorsteinsson and Rósa Gísladóttir. Jakobína came west on the same ship and same year with her parents, Sigbjörn Sigurðsson and Þuríður Benediktsdóttir. Both families settled in Lincoln County. Gísli and Jakobína farmed there, but later moved to Washburn, N. Dakota.