Sigvaldi Þorvaldsson was born on April 27, 1828 in Mýrasýsla. He died in Selkirk, Manitoba in 1894.
Spouse: October 11, 1858 Guðlaug Jónsdóttir b. 1823 in Snæfellsnessýsla, d. June 2, 1861 2) July 20, 1862 Ingibjörg Eggertsdóttir b. in Rauðseyjar in Breiðafjörður on October 24, 1830, d. August 15, 1900 in Selkirk.
Children: With Guðlaug: 1. Guðjón Gísli Mikael b. September 25, 1859, died in childhood. With Ingibjörg: 1. Kristján (Kris Walterson) b. September 7, 1862 2. Guðlaug b. March 14, 1865 3. Eggert Fjelsted b. March 7, 1868 4. Hjörtur Theódór (Ed Walterson) b. May 16, 1870 5. Þorvaldur (Walter Walterson) b. March 28, 1876. Sigvaldi also had a child with Gróa Árnadóttir: 1. Sigurgeir (Walterson) b. October 9, 1862.
They came west to Winnipeg, Manitoba in 1876 and moved on to New Iceland. They were first in Mikley but then settled in the Fljóts Settlement in 1878. They moved to Selkirk in 1890.