This problem requires tracing familial connections to determine the relationship between B and S.
We need to find how B relates to S. Let's trace the lineage starting from S:
Based on the steps above:
The relationship "Mother's mother's brother" precisely describes B in relation to S.
Mother = K
Mother's mother = K's mother = A
Mother's mother's brother = A's brother = B
Thus, B is S's Mother's mother's brother.
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