[If] two brothers were married to two minor orphaned sisters, and the husband of one died, she is discharged as his wife's sister. So too, [in the case of] two deaf-mutes.  [If one was] an adult and [one was] a minor —- [if] the minor's husband died, the minor is discharged as his wife's sister; [if] the adult's husband died, R' Eliezer says: We teach the minor to refuse him. Rabban Gamliel says: If she refused, then she did so; but if not, let her wait until she reaches adulthood, and the other will [then] be discharged as his wife's sister. R' Yehoshua says: Woe unto him because of his wife, and woe unto him because of his brother's wife —- he must divorce his wife, and perform chalitzah with his brother's wife.