In a coded relation, if P * Q means P is the mother of Q, P + Q means P is the father of Q, and P - Q means P is the sister of Q, what is the relationship of R if P * R + Q?

A. R IS Q'S BROTHER

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

D. NEPHEW

If A + B means A is the brother of B, and B - C means B is the sister of C, what is the relationship between A and C?

A. BROTHER

If M is the father of N, and N is married to O, what is O's relation to M?

A. SON-IN-LAW

If M × N means M is the son of N, N - O means N is the sister of O, and O + P means O is the father of P, what is the relationship of M to P?

A. COUSIN