X is the mother of Y. Z is the father of Y. How is Z related to X?

B. HUSBAND

D is the mother of E and F. G is the father of E. How is G related to F?

A. FATHER

O is the grandmother of P. Q is the mother of P. R is the brother of Q. How is R related to O?

A. UNCLE

X is the father of Y. Y is the brother of Z. How is Z related to X?

C. CHILD

O is the grandfather of P. Q is the father of P. R is the sister of Q. How is R related to O?

A. AUNT