Catechism of the Catholic Church §2233 — excerpt
Becoming a disciple of Jesus means accepting the invitation to belong to God's family, to live in conformity with His way of life: "For whoever does the will of my Father in heaven is my brother, and sister, and mother."
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.