John Locke. Treatise on Government. Chapter 6. Of Paternal Power. Section 58.
The power, then, that parents have over their children, arises from that duty which is incumbent on them, to take care of their off-spring, during the imperfect state of childhood. To inform the mind, and govern the actions of their yet ignorant nonage, till reason shall take its place, and ease them of that trouble, is what the children want, and the parents are bound to: for God having given man an understanding to direct his actions, has allowed him a freedom of will, and liberty of acting, as properly belonging thereunto, within the bounds of that law he is under. But whilst he is in an estate, wherein he has not understanding of his own to direct his will, he is not to have any will of his own to follow: he that understands for him, must will for him too; he must prescribe to his will, and regulate his actions; but when he comes to the estate that made his father a freeman, the son is a freeman too.