How does Ivik's life change at the start of the story in the novel, Eskimo Boy?

Ivik's father's death forces him into a position of responsibility, at which time, he realizes that he is not as grown up as he thought. His grandfather, Kriternerk, is too old and frail to hunt any longer; his mother, Ama, relies on Ivik to provide for his younger brother, Otonia, and his two little sisters, Aviak and Atupaluk. Suddenly, Ivik finds himself the head of the family, with new responsibilities and duties he must perform if the family is to survive.