Having six teenagers I have to agree with Mike. At some point you have to let them make their own mistakes. I have thee car nuts. One is a retail number freak who knows everything about the specifications of cars old and new, another likes to get dirty without any direction, the third is a replace the broken part only type of mechanic. I should open a dealership.
To be fair, there is an incredible amount of information out there. One has to decide which information is relevant/accurate to your cause and discard the rest.