Why do we feel at the end of the story that we know Sarty better than we know his father? To what degree does the end of “Barn Burning” offer closure?

Read the story “Barn Burning” by William Faulkner

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Question:
Why do we feel at the end of the story that we know Sarty better than we know his father? To what degree does the end of “Barn Burning” offer closure (a sense that all loose ends are accounted for and tied up?)