Leviticus 18:15-18
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15 Thou shalt not uncover the nakedness of thy daughter in law: she is thy son's wife; thou shalt not uncover her nakedness.
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16 Thou shalt not uncover the nakedness of thy brother's wife: it is thy brother's nakedness.
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17 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.
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18 Neither shalt thou take a wife to her sister, to vex her, to uncover her nakedness, beside the other in her life time.