Final answer:
Miss Mary's nephew in Laurie Halse Anderson's novel 'Chains' is the character who sells Isabel and Ruth to the Locktons against his aunt's will.
Step-by-step explanation:
The student is asking about a character from Laurie Halse Anderson's novel 'Chains'. In this historical fiction novel, Miss Mary Finch's nephew, who is not named in the text but is referred to simply as 'the nephew,' sells Isabel and her younger sister Ruth to the Locktons, going against Miss Mary's will that stated the sisters were to be freed upon her death. The main answer to who Miss Mary's nephew is that he is a character in the novel 'Chains' responsible for selling Isabel and Ruth into slavery despite the wishes of his late aunt.