W and X are brothers. S is the son of X and Q. R is married to U and is the brother of Q. T and V are the children of U. P is the mother of Q and Y is the mother of X. How is T related to S?

W and X are brothers.

S is the son of X and Q.

R is married to U and is the brother of Q.

T and V are the children of U.

P is the mother of Q and Y is the mother of X.

We don't know the gender of T so it may be mother's brother's son or mother's brother's daughter but in the given options, we have only mother's brother's son​

T is mother's brother's son of S.

Thus, correct option is (b).