I believe the answer is: The father
There are several factors that could influence BAC level in your body: The amount of alcohol consumed, gender, body size, and metabolism level. Since both the son and father has similar amount of drink, the father would most likely has higher BAC since our metabolism level would slowed down as we got older.
The satisfaction level of the father and son are different and the satisfaction level after consuming each drink start diminishing for both but at a different level.
The act of successfully satisfying one's wishes and requirements. The utility is a technical economic term that is fundamentally synonymous with more colloquial concepts like fulfillment, well-being, and, to some extent, wealth or happiness.
Thus, the satisfaction level for son and father is different after consuming each drinks.
Learn more about satisfaction levels here
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