Final answer:
Mrs. Hatcher wanted Peter to help his father because he is seen as dependable, the family is in financial need, and there is an underlying sense of familial duty and comfort that his presence brings.
Step-by-step explanation:
Mrs. Hatcher wanted Peter to help his father for a variety of reasons, which can be inferred from the different contexts provided. In some excerpts, it is clear that Peter is seen as dependable and capable despite his age, such as when he is noted for his high IQ and when the mother trusts him to help manage finances. In others, the need for help might stem from financial necessity, with Mrs. Hatcher being in debt and hoping her son can contribute in some way. Similarly, a familial duty is suggested where helping is simply what one does for family. Lastly, some instances highlight the emotion and comfort that a child’s presence can provide, even in difficult times.