Catechism of the Catholic Church §2205 — excerpt
The Christian family is a communion of persons, a sign and image of the communion of the Father and the Son in the Holy Spirit.
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.