Sisters originally refer to older women with their parents (or only with their parents) or peers. It also refers to women of the same age who are older than themselves, women who claim to be about the same age, and young women. Later refers to any woman older than herself.

In the Song Dynasty, people called their mothers, for example, Shang (the second empress Wu) said, "I am ashamed to know that you have the same hard work, but you are not as good as others.

As soon as my sister comes back, you will choose. "The sage bowed again and said to him," Elder sister is far away in the north, and male and female servants are not in the province. Every time it's beautiful, I serve a table of banquets, and tears come to my stomach just to think about it. I really never dreamed of this. "...-"Four Dynasties, a trip of sages without envy ".