Chapter 1, Mishnah 1: Fifteen women exempt their co-wives and their co-wives co-wives from chalitzah and levirate marriage, until the end of the world, and these are them: His [the levir's] daughter, his daughter's daughter, his son's daughter, his wife's daughter, his wife's son's daughter, his wife's daughter's daughter, his mother-in law, his mother-in-law's mother, his father-in-law's mother, his sister from his mother, his mother's sister, his wife's sister, and his brother-from-his-mother's wife, and his bother who was not in his world's wife, and his daughter-in law. Behold, these exempt their co-wives and their co-wives' co-wives from chalitzah and levirate marriage until the end of the world. And all of these, if they die or refused, or were divorced, or were found to sterile--the