A boy and his father are biking. His mother is off at work, and they were having a relatively good time, that is, until they both end up in a crash. They go to separate hospitals. The boy finds himself in a room with nurses swarming around him. The doctor finally arrives, but says "I cannot operate on this boy; he is my son." The boy is confused, because his father was also involved in the crash, and his mother was at work. So, who is the doctor?
The doctor is his mother. His mother's job was a doctor.