Leviticus 18:17
You shall not uncover the nakedness of a woman and of her daughter, and you shall not take her son's daughter or her daughter's daughter to uncover her nakedness; they are relatives; it is depravity.
Leviticus 20:14
If a man takes a woman and her mother also, it is depravity; he and they shall be burned with fire, that there may be no depravity among you.
Deuteronomy 27:23
"'Cursed be anyone who lies with his mother-in-law.' And all the people shall say, 'Amen.'
Amos 2:7
those who trample the head of the poor into the dust of the earth and turn aside the way of the afflicted; a man and his father go in to the same girl, so that my holy name is profaned;