Here is an even better way to phrase the question with respect to schooling: You spend 10 years telling John and Jane some stuff every day for hours. John also

Here is an even better way to phrase the question with respect to schooling: You spend 10 years telling John and Jane some stuff every day for hours. John also gets told stuff for hours by a third party while Jane gets all information from you. Which one is easier to lie to? School adds a third party so that the child isn't reliant on things taught by their parents.