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

A. SISTER

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

A. BROTHER

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

A. GRANDFATHER

K is the daughter of L. M is the son of L. N is the sister of M. How is K related to N?

A. COUSIN

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