Generally speaking, most small scale ventures can be used to teach your kids about entrepreneurship and develop key skills that will be useful for the rest of their lives. Financial literacy is a necessary life skill that can significantly influence the fortunes (pun intended) of the youth and help pave the way towards financial freedom.
Look, nothing against your parents, but face the facts - they lied to you. If having a great future were as simple as going to school and getting good grades, we wouldn't have overpopulated prisons and homeless school teachers living in their cars. Give your kids the opportunity that you wish you'd had: teach them about entrepreneurship and financial literacy so that they can have the future they deserve.