In Egyptian mythology, which god of the earth was the father of Osiris?

Geb was the Egyptian god of the Earth and later a member of the Ennead of Heliopolis. He had a viper around his head and was thus also considered the father of snakes. It was believed in ancient Egypt that Geb's laughter created earthquakes and that he allowed crops to grow.

The oldest representation in a fragmentary relief of the god, was as an anthropomorphic bearded being accompanied by his name, and dating from king Djoser's reign, 3rd Dynasty, and was found in Heliopolis. In later times he could also be depicted as a ram, a bull or a crocodile (the latter in a vignette of the Book of the Dead of the lady Heryweben in the Egyptian Museum, Cairo).

In mythology, Geb also often occurs as a primeval divine king of Egypt from whom his son Osiris and his grandson Horus inherited the land after many contendings with the disruptive god Set, brother and killer of Osiris. Geb could also be regarded as personified fertile earth and barren desert, the latter containing the dead or setting them free from their tombs, metaphorically described as "Geb opening his jaws", or imprisoning those there not worthy to go to the fertile North-Eastern heavenly Field of Reeds.