Leviticus 18:17
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.
Cross-reference
Leviticus 20:14
Parallel
Leviticus 20:14 prescribes burning as punishment for the very act forbidden here — marrying a woman and her daughter.
Deuteronomy 27:23
Parallel
Deuteronomy 27:23 curses lying with one's mother-in-law, a related family incest prohibition (wife's mother).
Amos 2:7
Related theme
Amos 2:7 condemns father and son having sex with the same girl — another family sexual sin, though not the same relationship.