Catechism of the Catholic Church §1655 — excerpt
Christ chose to be born and grow up in the bosom of the holy family of Joseph and Mary. the Church is nothing other than "the family of God."
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.