In the passage Early Babylonian Myth, in which of the plot sequences does this passage belong?

The beginning of the story

It is likely that this passage is supposed to be placed at the beginning of the story. This is due to the fact that the passage deals with the beginning of the family's lineage. Moreover, the passage describes how the two gods had children, and how these children became the sky and the earth. We can conclude that the author believes this to be the beginning of the world.