If the neighbor was correct and he/she actually saw one of the older girls driving into and out of the Turpin driveway, either she had a drivers license or not. If so, she had to be able to read and pass the drivers test and know the basic driving laws, which would mean that she spent time outside of the home, being taught, and is licensed by the state. If not licensed, the Turpins were taking one hell of a risk of her getting stopped by the police and possibly ratting them out, or being involved in an accident or just escaping and driving To the police. In either case, the driver girl would certainly know what a police officer is. JMO Also, it seems more logical to me that they would let the college class son be a driver.....but then nothing about them is logical