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

A. BROTHER

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

A. SISTER

P is the uncle of Q. R is the sister of P. How is R related to Q?

A. AUNT

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

A. DAUGHTER

M is the grandmother of N. N has a brother O. How is M related to O?

C. GRANDMOTHER