In a family, there are three children: X, Y, and Z. X is the son of A and B. Y is the daughter of A and B. Z is the son of C, who is the sister of A. How is Z related to X?
In a family of six members: P, Q, R, S, T, and U, P is the father of Q, Q is the mother of R, S is the sister of T, and U is the brother of R. Who is the grandmother of R?
In a class of students: X, Y, Z, W, and V, X is smarter than Y but not as smart as Z. W is smarter than V but not as smart as X. Who is the least smart?
Four friends A, B, C, and D are sitting in a row. A is to the left of B but to the right of C. D is sitting at one of the ends. Who is sitting in the middle?
Five people are standing in a line: A, B, C, D, and E. A is taller than B but shorter than C. D is shorter than E but taller than A. Who is the tallest?