I have always stood on this Scripture for my children! Proverbs 22:6:
6 Train up a child in the way he should go [and in keeping with his individual gift or bent], and when he is old he will not depart from it. AMP
I especially like the Amplified Bible for this one because it includes being aware of the particular gifts and talents that God has placed within them! This is vital for a parent to know and to do! We have the responsibility to recognize in them, with the help of the Spirit of God, those special endowments so that we can steer them to develop them! Teaching and training them to develop these "talents" will prepare them to be found faithful when the Master desires an accounting! Here are two more Scriptures, Ephesians 6:4 and 2 Timothy 3:15, that encourage the training of our children! they are WELL able to grow in understanding of the thins of God! The SOONER we begin, the better!
4 Fathers, do not irritate and provoke your children to anger [do not exasperate them to resentment], but rear them [tenderly] in the training and discipline and the counsel and admonition of the Lord. AMP
15 And how from your childhood you have had a knowledge of and been acquainted with the sacred Writings, which are able to instruct you and give you the understanding for salvation which comes through faith in Christ Jesus AMP
Shalom in Him!