A is the brother of B. C is the sister of B. D is the mother of A. How is D related to C?

A. MOTHER

X is the father of Y. Y has a sister Z. W is the son of Z. How is W related to X?

A. GRANDSON

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

A. SISTER

M is the grandmother of N. N has an uncle O. O is the son of P. How is P related to M?

A. SON

A is the sister of B. C is the brother of A. D is the father of B. How is D related to C?

A. FATHER