Child labor is still child labor. Apprenticeship is another thing. Doing chores at home doesn't even register here. Yuna is exploring child labor, and is using lame excuses. No discussion here, that's her ethics. Is she giving them better working conditions? Sure. That's how she justifies...
How easy is to defend child labor. Children aren't supposed to work. They have to eat, play and learn. That's it. All the idea of "giving them a way to earn their food" is BS.