If A is the brother of B, and B is the sister of C, how is A related to C?

A. BROTHER

P is the uncle of Q. R is the sister of Q. How is P related to R?

C. UNCLE

If X is the father of Y and Y is the son of Z, what is Z's relation to X?

C. WIFE

If A is the mother of B and B is the sister of C, what is the relationship between A and C?

B. MOTHER

A is the sister of B. B has a son named C. How is C related to A?

A. NEPHEW