And it came to pass on the morrow, that the firstborn said unto the younger, Behold, I lay yesternight with my father: let us make him drink wine this night also; and go thou in, and lie with him, that we may preserve seed of our father.
The next day, the older brother told the younger one, "I slept with our dad last night. Let's get him drunk tonight too. Then you can sleep with him, so we can keep our dad's sperm alive.