One day Ra, the god of the sun hatched out of his egg that had been floating in water.
Ra had two grandsons, Set and Osiris. Ra thought Set was ok, but he loved Osiris. So, Ra made Osiris the first pharaoh of Egypt. Set got really jealous, so he went and cut Osiris into little pieces and threw them into the Nile River.
Osiris' wife Isis was not happy when she found out about what happened. So, she found all of the pieces of him and took them to one of her good friends Anubis so that he could put Osiris back together again.
When Ra found out what happened he was furious. So, he gave Osiris a new job and that was to be god of the dead and he would rule over the land of the dead.
Osiris' son Horus found out that his uncle Set did and he went and killed Set.
Isis knew that she would never see Osiris again because she would forever live in the world of the living and he would live in the world of the dead. So, every day since then, she has cried into the Nile River and it rises from her tears.