If P is the uncle of Q, and Q is the daughter of R, what is the relationship of R to P?

C. BROTHER-IN-LAW

If S is the son of T and T is the daughter of U, what is S's relation to U?

A. GRANDSON

If M is the grandmother of N and N is the son of O, what is the relationship of O to M?

C. DAUGHTER-IN-LAW

If M is the father of N and N is the son of O, what is the relationship between M and O?

B. HUSBAND AND WIFE

If A is the brother of B, and B is the sister of C, what is the relationship of C to A?

B. BROTHER