Why do Guangxi people call their mother Qisao?

Guangxi people call their mother Qisao because it is an expression of Guangxi dialect. "Mother's seventh sister-in-law" means "mother and seventh sister-in-law" in Chinese, but this word means the title of mother in Guangxi dialect. The origin of this title is related to the history, culture, geographical environment and national customs of Guangxi. Guangxi is a multi-ethnic community, including Zhuang, Han, Yao and Miao nationalities. Generally speaking, "mother's seventh sister-in-law" is a kind of address for mother in Guangxi and an expression of Guangxi dialect.