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

A. SISTER

If J is the daughter of K, and K is the son of L, what is the relationship of L to J?

B. GRANDFATHER

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

A. AUNT

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

A. SISTER

D is the daughter of E, and F is the brother of E. What is F to D?

A. UNCLE