If N is the father of O and P is the son of O, what is the relationship of N to P?

A. GRANDFATHER

If M is the uncle of N, and N is the daughter of O, what is the relationship of O to M?

C. BROTHER-IN-LAW

If X - Y means X is the sister of Y, Y + Z means Y is the father of Z, and Z * W means Z is the son of W, what is the relationship of X to W?

A. X IS THE AUNT OF W

D is the daughter of E. F is the son of E. How is F related to D?

A. BROTHER

If G is the son of H, and H is the sister of I, what is the relationship of G to I?

A. NEPHEW