Jinx is technically not old enough to be paid for work. However, there is something called an allowance.
Why can't Doc just set up a deal where he's paying Jinx's father the money that Jinx earns by helping out at the shop, and Jinx's father then pays Jinx this money in installments equal to a paycheck for whatever the rate he gets his allowance (weekly, monthly, etc.)? That way, it's technically allowance money right?
However, I do know woefully little about economics and economic law, so I could be wrong. Any objections?