90 In promoting this participation by the laity in the apostolate, which is so important in our times, the family has a special mission, for it is the spirit of the family that exercises the most powerful influence on that of the rising generation. As long as the sacred flame of the Faith burns on the domestic hearth, and the parents forge and fashion the lives of their children in accordance with this Faith, youth will be ever ready to acknowledge the royal prerogatives of the Redeemer, and to oppose those who wish to exclude Him from society or wrongly to usurp His rights.
Source: Summi Pontificatus (Vatican.va)