P, Q, R, S, T and U are six members of a family. R is not the mother of Q but Q is the son of R. P and R are a married couple. T is the brother of R. U is the brother of Q. S is the daughter of P. In this case, T is related to S as being :
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When ``R is not the mother but Q is son of R,'' R must be the father. Construct the family tree: married couple + their children, then add siblings of parents as aunts/uncles.