If D is the father of E and E is the mother of F, what is D's relation to F?

A. GRANDFATHER

If J is the son of K and L is the daughter of K, what is L's relation to J?

A. SISTER

If A ÷ B means A is the sister of B, A * B means A is the father of B, and A + B means A is the mother of B, what is the relationship of C if A * C ÷ B?

C. C IS A'S SON

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

A. NIECE

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

A. BROTHER