M is the daughter of N. O is the son of N. How is O related to M?

A. BROTHER

P is the uncle of Q. Q is the daughter of R. How is R related to P?

A. BROTHER

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

C. GRANDMOTHER

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

B. FATHER

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

B. SON