During the scene around the dinner table, Charles mentions that he quit school to go to work when he was twelve, but that he had to do it because he was "the man of the house" and was expected to support his family. But in Season 3's Journey in the Spring, we are introduced to Charles' parents, who are happily married, even though the husband was always a self-pitying downer. We know from this episode that Lansford was clearly in his son Charles' life as a child, and furthermore, Charles has an older brother named Peter, so if any of the Ingalls boy were the "man of the house," it was older child Peter.
Reply: True, but in Season 3's Journey in the Spring, Part 1, we met Peter as an adult, and it was clear that he was very bitter and resentful toward their father. It's reasonable to believe, then, that Peter had that anger when they were kids, forcing Charles to step up and be the mature one.