From the Catechism of the Catholic Church
2221 The fecundity of conjugal love cannot be reduced solely to the procreation of children, but must extend to their moral education and their spiritual formation. "The role of parents in education is of such importance that it is almost impossible to provide an adequate substitute."29 The right and the duty of parents to educate their children are primordial and inalienable.30
2222 Parents must regard their children as children of God and respect them as human persons. Showing themselves obedient to the will of the Father in heaven, they educate their children to fulfill God's law.
2223 Parents have the first responsibility for the education of their children. They bear witness to this responsibility first by creating a home where tenderness, forgiveness, respect, fidelity, and disinterested service are the rule. The home is well suited for education in the virtues. This requires an apprenticeship in self-denial, sound judgment, and self-mastery - the preconditions of all true freedom. Parents should teach their children to subordinate the "material and instinctual dimensions to interior and spiritual ones."31 Parents have a grave responsibility to give good example to their children. By knowing how to acknowledge their own failings to their children, parents will be better able to guide and correct them:
He who loves his son will not spare the rod. . . . He who disciplines his son will profit by him.32
Fathers, do not provoke your children to anger, but bring them up in the discipline and instruction of the Lord.33
2224 The home is the natural environment for initiating a human being into solidarity and communal responsibilities. Parents should teach children to avoid the compromising and degrading influences which threaten human societies.
2225 Through the grace of the sacrament of marriage, parents receive the responsibility and privilege of evangelizing their children. Parents should initiate their children at an early age into the mysteries of the faith of which they are the "first heralds" for their children. They should associate them from their tenderest years with the life of the Church.34 A wholesome family life can foster interior dispositions that are a genuine preparation for a living faith and remain a support for it throughout one's life.
2226 Education in the faith by the parents should begin in the child's earliest years. This already happens when family members help one another to grow in faith by the witness of a Christian life in keeping with the Gospel. Family catechesis precedes, accompanies, and enriches other forms of instruction in the faith. Parents have the mission of teaching their children to pray and to discover their vocation as children of God.35 The parish is the Eucharistic community and the heart of the liturgical life of Christian families; it is a privileged place for the catechesis of children and parents.
2227 Children in turn contribute to the growth in holiness of their parents.36 Each and everyone should be generous and tireless in forgiving one another for offenses, quarrels, injustices, and neglect. Mutual affection suggests this. The charity of Christ demands it.37
2228 Parents' respect and affection are expressed by the care and attention they devote to bringing up their young children and providing for their physical and spiritual needs. As the children grow up, the same respect and devotion lead parents to educate them in the right use of their reason and freedom.