Where did Sister Yun's children come from in Guangxi?

It's my cousin's child. Sister Yun can't have children. She went to all the hospitals, but she couldn't get pregnant. She went to consult a friend who was a test-tube baby, but her wish didn't come true. She has been paying attention to the welfare home and wants to adopt a child by herself. Later, because the country opened three children, her cousin said that the first two children were boys and the third child wanted a girl. It turned out to be a son, so she raised the child for Sister Yun and had a child of her own.