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

A. SISTER

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

A. BROTHER

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

A. DAUGHTER

K is the son of L. M is the daughter of L. N is the brother of K. How is M related to N?

A. SISTER

If A is the sister of B and C is the brother of A, how is C related to B?

A. BROTHER