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

A. NIECE

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

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 X * Y means X is the father of Y, and Y ÷ Z means Y is the mother of Z, what is the relationship between X and Z?

A. GRANDFATHER

If P × Q means P is the mother of Q, and Q + R means Q is the brother of R, what is the relationship between P and R?

B. MOTHER