A family consists of a father, a mother, and three children: P, Q, and R. P is the eldest child and is a doctor. Q is the youngest child and is a student. R is a teacher and is the middle child. What is the profession of the mother if the father is a lawyer?
In a group of five pets: Cat A is heavier than Cat B but lighter than Cat C. Dog D is heavier than Cat A but lighter than Dog E. Which pet is the lightest?