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

C. NIECE

M is the grandmother of N. N has a brother O. How is M related to O?

C. GRANDMOTHER

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

A. NIECE

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 G related to F?

B. FATHER