Catechism of the Catholic Church §2227 — excerpt
Children in turn contribute to the growth in holiness of their parents. Each and everyone should be generous and tireless in forgiving one another for offenses, quarrels, injustices, and neglect.
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.
Also cites: GS 48 # 4