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

A. SISTER

D is the mother of E and F. G is the father of E. How is F related to G?

A. SON

H is the uncle of I. J is the sister of I. How is H related to J?

B. UNCLE

O is the grandmother of P. Q is the mother of P. R is the father of P. How is O related to R?

A. MOTHER-IN-LAW

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

A. SISTER