As his cult arose in the Egyptian pantheon, Rah often replaced Atum as the father, grandfather, and great-grandfather of the deities of the Ennead, and became a creator of the world.
There is question amongst the Egyptologists as to whether the Heliopolis priesthood placed their local sun-god, Ra, above all other deities such as Osiris. Rather, it appears that the Great Ennead (meaning nine deities of Atum, Geb, Isis, Nut, Osiris, Nephthys, Seth, Shu, and Tefnut) appeared during the decline of Ra's cult in the sixth dynasty and after the introduction of the new pesedjet. Ra saw a resurgence until Horus gained prominence. Worship then focused on Ra-harakhty (meaning Ra, who is Horus of the Two Horizons). As a visual expression of Ra, a wall was built to the city of Cairo with blocks from the Temple of Annu after an attempt to lessen the influence of the temple of Atum.
The cult of the Mnevis bull, an embodiment of Ra, had its centre here and established a formal burial ground for the sacrificed bulls north of the city.
In the later myths, Ra then was seen to have created Sekhmet, the early lioness war goddess, who becomes Hathor, the cow goddess, after she has sufficiently punished mankind as an avenging Eye of Ra, and so by changing the themes of much earlier myths into aspects of his, he is often said to be the father of both and brother to the god, Osiris. Afterward, nearly all forms of life supposedly were created only by Ra, who called each of them into existence by speaking their secret names and eventually, humans were created from Ra's tears or sweat, and asserting that the Egyptians then called themselves the 'Cattle of Ra.' - Wikipedia
Ra had 4 children:
- Nut (sky) - Shu - Tefnut (together the Air) - Geb (Earth)
- Nut and Geb created 4 children:
- Set - Osiris - Isis - Nephthys
- Isis and Osiris created - Horus
Wikipedia - Ra