Calm, Peaceful, Tranquil

B. SERENE

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

A. BROTHER

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

A. UNCLE

G is the mother of H. I is the sister of G. How is I related to H?

A. AUNT

J is the father of K. L is the son of K. How is J related to L?

A. GRANDFATHER