Finn was one of the eight children, seven brothers and a sister, of Árni Arnmódsson or Armódsson, a lendmann, and his wife Þora Þorsteinsdóttir (daughter of Thorstein Gallows).
Finn was one of the eight offspring, seven brothers, and a sister, of Árni Arnmódsson or Armódsson, a lendmann, and his spouse Þora Þorsteinsdóttir (daughter of Thorstein Gallows).