"You are not to have sexual relations with the daughter of your father's wife. Born of your father, she's your sister, so you are not to have sexual relations with her.

So you are not to let the land vomit you up because of your uncleanness as it is vomiting the nations that were here before you.

"Neither your father's nakedness nor your mother's nakedness is to be exposed. She's your mother, so you are not to have sexual relations with her.