In a group of five friends: Alice, Bob, Charlie, David, and Eva, Alice is taller than Bob but shorter than Charlie. David is shorter than Eva but taller than Bob. Who is the tallest among them?
In a family of five members A, B, C, D, and E, A is the father of B. C is the mother of B and D is the sister of B. E is the grandfather of B. How is D related to E?