29 Therefore the Rosary of the Blessed Virgin Mary, combining in a convenient and practical form an unexcelled form of prayer, an instrument well adapted to preserve the faith and an illustrious example of perfect virtue, should be often in the hands of the true Christian and be devoutly recited and meditated upon. We address this commendation especially to the Confraternity of the Holy Family which We recently praised and approved. Since the mystery of the hidden life which Christ our Lord long led within the walls of the house in Nazareth is the reason for the existence of this association, that its members may constantly conform themselves to Christian life on the model of the Holy Family established by God Himself, its intimate connection with the Rosary is plain.
Source: Magnae Dei Matris (Vatican.va)