Piper has an excellent post on a very specific, and perplexing, question about parenting. I have wondered about it many times. The question he sets out to answer is "Why should parents require submissive behaviors of children when they may be unregenerate rebels at heart?".
Here are his three main points:
1) For children, external, unspiritual conformity to God’s commanded patterns of behavior is better than external, unspiritual non-conformity to those patterns of behavior.
2) Requiring obedience from children in conformity with God’s will confronts them with the meaning of sin in relation to God, the nature of their own depravity, and their need for inner transformation by the power of grace through the gospel of Christ.
3) The marks of devotion, civility, and manners (“please,” “thank you,” and good eye contact) are habits that, God willing, are filled later with grace and become more helpful ways of blessing others and expressing a humble heart.
Read the whole thing here.