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

A. SISTER

X is the father of Y. Y is the sister of Z. W is the brother of X. How is W related to Z?

A. UNCLE

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

A. NIECE

M is the mother of N. N is the father of O. How is M related to O?

A. GRANDMOTHER

X is the father of Y. Y is married to Z. Z has a brother W. How is W related to X?

B. SON-IN-LAW