As I often like to say, "Don't play telephone with your descendants!" when it comes to transmitting values. Get it all down in writing! If you simply utter words to your children and grandkids, those words can be forgotten or worse, transmogrified into something unrecognizable in just a few generations.
Attorneys often recommend writing what is often called an "ethical will" which is not really a formal legal document, just an expression of your values. You don't really need an attorney for this type of thing, and you may be better off with the professional writing services over at Opex Legacies, something they call "Your Story," a life history sounding pretty close to an ethical will.
Still, it may be a good idea to run the final draft by your attorney just to make sure there are no statements inconsistent with your estate plan.
If you want to supplement the precatory language of a so-called ethical will with something more enforceable, consider the incentive provisions of a F.I.R.S.T. Family Trust: http://7-4-1776.US