If D is the daughter of E and F is the son of E, what is F to D?

A. BROTHER

If J is the sister of K and L is the brother of K, what is L to J?

B. BROTHER

If M is the grandmother of N and O is the father of N, what is M to O?

A. MOTHER

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

A. SISTER

D is the son of E and F is the daughter of E. How is F related to D?

A. SISTER