Catechism of the Catholic Church §2786 — excerpt
"Our" Father refers to God. the adjective, as used by us, does not express possession, but an entirely new relationship with 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.