Leviticus 18:16

Thou shalt not uncover the nakedness of thy father's brother, thou shalt not approach to his wife: she [is] thine aunt.

Thou shalt not uncover the nakedness of thy daughter in law: she [is] thy son's wife; thou shalt not uncover her nakedness.

Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son's daughter, or her daughter's daughter, to uncover her nakedness; [for] they [are] her near kinswomen: it [is] wickedness.

Neither shalt thou take a wife to her sister, to vex [her], to uncover her nakedness, beside the other in her life [time].