He who cohabits with his mother-in-law may be liable for her as his mother-in-law, his daughter-in-law, his wife’s sister, his brother’s wife, his father’s brother’s wife, a married woman, and a menstruant. And so is he who cohabits with his motherin-law’s mother or his father-in-law’s mother. R’ Yochanan ben Nuri says: He who cohabits with his mother-in-law can be liable for her as his mother-in-law, his mother-in-law’s mother, and his father-in-law’s mother. They said to him: The three of them are of one denomination.