M is the daughter of N. O is the son of N. How is O related to M?

A. BROTHER

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

A. GRANDSON/GRANDDAUGHTER

P is the daughter of Q. R is the son of S, who is the sister of Q. How is R related to P?

A. COUSIN

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

A. SISTER

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

B. FATHER