One of Mr. Horton, his wife, their son, and Mr. Horton’s mother is a doctor and another is a lawyer a) If the doctor is younger than the lawyer, then the doctor and the lawyer are not blood relatives b) If the doctor is a woman, then the doctor and the lawyer are blood relatives c) If the lawyer is a man, then the doctor is a man. Whose occupation you know?

This logical deduction puzzle yields Mr. Horton as the doctor. Condition (a) fails if the mother is doctor (older than son lawyer, but blood relatives). Condition (b) fails if wife is doctor and son is lawyer (not blood relatives). The only consistent solution is Mr. Horton as doctor with his son as lawyer - doctor is younger, not blood relatives, satisfying all conditions.