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 group of five friends: Alice, Bob, Charlie, David, and Eva, Alice is a teacher, Bob is a doctor, Charlie is a lawyer, David is a teacher, and Eva is a doctor. Which of the following pairs consists of individuals from the same profession?
A family consists of a father, a mother, and three children: John, Lisa, and Mark. John is the eldest, Lisa is the only daughter, and Mark is the youngest. Which of the following is true?