1. The word "sister" is more frequent and colloquial than the word "sister".
2. Sisters and sisters have different scopes. For example, there are several sisters in a family, including brothers and sisters. When asked how many sisters in a family, they only refer to sisters and sisters.
Appellation between relatives:
In the first nine generations, the person who gave birth to himself was the parent, the father of the father was the grandfather, the father of the grandfather was the great grandfather, the father of the great grandfather was the great grandfather, the father of the great grandfather was the Tianzu, the father of the Tianzu was the Liezu, the father of the Liezu was the Taizu, the father of the Taizu was the distant ancestor, and the father of the distant ancestor was the ancestor.
The next nine generations are called: the son of the father is the son, the son of the son is the grandson, the son of the grandson is the great grandson, the son of the great grandson is the Xuansun, the son of the Xuansun is the Laisun, the son of the Laisun is the Yousun, the son of the Yousun is the still grandson, the son of the still grandson is the Yunsun, and the son of the Yunsun is the ear grandson.
Husband: a married woman's name for her partner; Daughter in law: a married man's name for his partner; Father-in-law: the husband's father, also known as father; Mother in law: her husband's mother, also called mother; Father-in-law: wife's father, also called father; Mother in law, mother-in-law: wife's mother, also known as mother; Daughter in law: refers to a son's wife; Son in law: a title for the daughter's husband; Sister-in-law: a name for a brother's wife; Sister, sister-in-law: the name of the younger brother's wife; Brother-in-law: refers to the elder sister's husband; Husband: a title for her sister's husband; Sister-in-law: the mutual address or joint address of a brother's wife; Sister in law: the name or joint name of the husbands of sisters, also called brother in law; Eldest sister-in-law: a title for her husband's sister; Sister-in-law: a name for her husband's sister.