Literature Reference: Daughters from poor families are hard to marry, and those who marry late are filial to their mothers-in-law. Source from 'Ten Poems of Qinzhong: On Marriage'.
孝: Filial piety and integrity refer to being a dutiful child and maintaining incorruptibility.
姑:
Meaning: Filial piety towards one's mother-in-law, embodying traditional virtues and family harmony.