If X × Y means X is the brother of Y, and Y ÷ Z means Y is the daughter of Z, what is the relationship of X to Z?

D. GRANDSON

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

B. HUSBAND

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

A. BROTHER

If D is the daughter of E, and E is the mother of F, what is F to D?

D. SON

If N is the granddaughter of O, and P is the daughter of N, what is O to P?

D. GRANDPARENT