《礼记·杂记上》
吉祭的时候，自称 孝子 或 孝孙 ；丧事中的讣告和祭文，自称 哀子 或 哀孙 。
祭称孝子、孝孙，丧称哀子、哀孙。
During auspicious offerings, they called themselves孝子 or孝孙; in the obituary and sacrificial text during the mourning, they called themselves哀子 or哀孙.