⁹ Never have sexual intercourse with your stepsister, whether she is your father’s daughter or your mother’s daughter. It makes no difference whether or not she was born in your house. ¹⁰ Never have sexual intercourse with your granddaughter, whether she is your son’s daughter or your daughter’s daughter, because she is related to you. ¹¹ Never have sexual intercourse with a daughter of your father and his wife. She is your own sister.