P is the son of Q while Q and R are the sisters to one another. T is the mother of R. If S is the son of T, which of the following statements is correct ?

The correct answer is: B. S is the cousin of P

P is the son of Q. Q and R are sisters. T is the mother of R. S is the son of T.

To find the relationship between S and P, we can draw a family tree.

Q |   |   |
\ /   /   /
 P   R   S

From the family tree, we can see that S is the son of T, who is the mother of R. R is the sister of Q, who is the mother of P. Therefore, S is the cousin of P.

A. T is the brother of Q is incorrect because T is the mother of R, not the brother of Q.
C. Q and S are sisters is incorrect because Q is the mother of P, not the sister of S.
D. S is the maternal uncle of P is incorrect because S is the cousin of P, not the maternal uncle of P.
E. R is the grandfather of P is incorrect because R is the sister of Q, not the grandfather of P.