M is the grandmother of N. N has a brother O. What is M's relation to O?

B. GRANDMOTHER

T is the son of U. V is the daughter of U. W is the brother of T. How is W related to V?

B. BROTHER

K is the father of L and M. N is the sister of K. How is N related to L?

A. AUNT

O is the son of P. Q is the daughter of R, who is the brother of P. How is Q related to O?

A. COUSIN

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