Leviticus 18:15-17

15You are not to have sexual intercourse with your daughter-in-law. She is your son’s wife; you are not to have sex with her.

16You are not to have sexual intercourse with your brother’s wife; she is your brother’s family.

17You are not to have sexual intercourse with a woman and her daughter. You are not to marry her son’s daughter or her daughter’s daughter and have sex with her. They are close relatives; it is depraved.