The Best Use of Our Gifts

What am I supposed to teach our children about their responsibility to use their gifts? What is the highest, the purest, the best use of our gifts? The first answer that comes to mind and has throughout my life is using gifts for big audiences, which implies maximizing visible effects, fame and acclaim. But I don't believe that's the best barometer for "success." So what is? I don't know how to answer it for myself, so how can I give them an answer, advocate for a particular package with a bow on top?

I believe, and can see more clearly all the time, that being a husband and father is the most important work I can be doing. But is that because I believe the net positive effect will be bigger by my work through them, or because it meets the criteria for some other barometer?

How should I answer this question?