Changing Relatives, Xiulan's Miserable Life

"Changing Marriage" In the early 1980s, in a village in the mountains of a certain city, the village was called Xingziyu. There was a poor and old-fashioned family. Their father died early, and their mother took care of the baby at home. One of the brothers was herding sheep at home, and the other was working outside. They also had a younger sister who was mentally retarded! One day, someone proposed a marriage to his younger brother. It was a marriage exchange. The marriage exchange meant that the younger brother would marry his sister, and he would marry the sister of both brothers! The eldest brother agrees, but the younger brother disagrees! The man my sister swapped with is a normal person! The girl the brother swapped with was less intelligent, but she was better than the brothers' sister! Character: The mother is selfish and the image of the evil mother-in-law The eldest brother is illiterate and stingy. He only wants to guard his twenty sheep. My younger brother works outside and is smarter than my older brother. My sister was born with mental retardation and polio The brother who changed relatives is a normal person and a kind person. The younger sister who changed her marriage had a high fever when she was a child, and her intelligence was slightly lacking.