If parents raise their children according to the Bible, does God promise to bring them to know him?

The Desiring God website has a useful section, Ask Pastor John, where John Piper answers many questions. Piper's answers are always grounded in the Scriptures, thoughtful and stimulating even if you disagree with his answer. I think this is a great resource for parents many of the answers are in a video format and are about 3 to 4 minutes in length. In this video Piper answers a question that is on every Christian parent's mind.