Rhea was the Titaness daughter of Uranus, the sky, and Gaia, the earth, in Greek mythology. She was known as "the mother of gods". In earlier traditions, she was strongly associated with Gaia and Cybele, the Great Goddess, and was later seen by the classical Greeks as the mother of the Olympian gods and goddesses, though never dwelling permanently among them on Mount Olympus. The Romans identified Rhea with the Goddess Ops.
Uranus by *GENZOMAN Uranus (play /ˈjʊərənəs/ or /jʊˈreɪnəs/) (Ancient Greek Οὐρανός, Ouranos meaning "sky"), was the primal Greek god personifying the sky. In Ancient Greek literature, according to Hesiod in his Theogony, Uranus or Father Sky was the son and husband of Gaia, Mother Earth. Uranus and Gaia were ancestors of most of the Greek gods, but no cult addressed directly to Uranus survived into Classical times.Uranus does not appear among the usual themes of Greek painted pottery.
Zeus was the god of the sky and ruler of the Olympian Greek gods. He overthrew his Father Cronus, then drew lots with his brothers Poseidon and Hades. He won the draw & became the supreme ruler of the gods. He is lord of the sky. His weapon is a thunderbolt. He is married to Hera and is represented as the god of justice and mercy, the protector of the weak, and the punisher of the wicked.
Gaia was the primordial Earth-goddess in ancient Greek religion. Gaia was the great mother of all: the heavenly gods and Titans were descended from her union with Uranus (the sky), the sea-gods from her union with Pontus (the sea), the Giants from her mating with Tartarus (the hell-pit) and mortal creatures were sprung or born from her earthy flesh. Her equivalent in the Roman pantheon was Terra.