Final answer:
In Sahagún's study of the Aztecs, the father's main duty was to ensure male succession, educate children, and maintain family prosperity.
Explanation:
The principle duty of the father according to Sahagún's study of the Aztecs was to ensure male succession within the family.
The eldest son, if fulfilling his duty, was highly respected and considered essential for the family's prosperity.
Additionally, fathers were responsible for the education and upbringing of their children, teaching them piety, wisdom, and skills according to their gender.
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