A little leaven leaveneth the whole lump. It only takes a little bit of evil to corrupt that which is good. If you fail to stand against evil, evil will be justified, and will affect others. Teach your children the ways of the Lord. Education is to be based upon the scriptures.
Fathers are to teach and correct their children.
I have no greater joy than to hear that my children walk in truth. Our godly children are our reward. The Bible teaches that the parents are responsible for our children. The Bible never gives the government authority over the children. Every reference to a child's behavior is within the context of the family.