Are you asking for novel spoiler? If so, check the spoiler tagged comment below.
Based on the novel, she was not sold. When the father died, she lived with the new family of her mother but her stepsister does not like her so she was brought to her grandmother. When the grandmother's health deteriorated, she was brought to her oldest uncle (father side). The wife of her oldest uncle is the autie who pesters YF. That autie has a brother-the one who tried to rape YF