Rhea: First Generation Titaness
Reference: Mother of Gods
Parents: Gaia and Uranus
Siblings: Cronos, Oceanus, Hyperion, Theia, Coeus, Phoebe, Lapetus, Crius,
Mnemosyne, Tethys
Consort: Cronos
Children: The first generation gods

Oceanus: First Generation Titane
Reference: Ruler of the Atlantic, the World Sea/Ocean
Parents: Gaia and Uranus
Siblings: Rhea, Cronos, Hyperion, Theia, Coeus, Phoebe, Lapetus, Crius, Mnemosyne, Tethys
Consort: Tethys
Children: Major River Systems, Perse, Metis, Dione, Asia and the Oceanids

Tethys: First Generation Titaness
Reference: Poetry
Parents: Gaia and Uranus
Siblings: Rhea, Cronos, Hyperion, Theia, Coeus, Phoebe, Lapetus, Crius, Mnemosyne, Oceanus
Consort: Oceanus
Children: Major River Systems, Perse, Metis, Dione, Asia and the Oceanids

Hyperion: First Generation Titane
Reference: God of Light, Watcher from Above, God or Pillar of the East
Parents: Gaia and Uranus
Siblings: Rhea, Cronos, Theia, Coeus, Phoebe, Lapetus, Crius, Mnemosyne, Oceanus
Consort: Theia
Children: Helios, Selene, possibly Eos

Theia: First Generation Titaness
Reference: Mother of the Sun, Theia of Many Names
Parents: Gaia and Uranus
Siblings: Rhea, Cronos, Hyperion, Coeus, Phoebe, Lapetus, Crius, Mnemosyne, Oceanus
Consort: Hyperion
Children: Helios, Selene, Eos

Coeus: First Generation Titane
Roman Equivalent: Polus
Reference: God of Wisdom and Intellect
Parents: Gaia and Uranus
Siblings: Rhea, Cronos, Hyperion, Phoebe, Lapetus, Crius, Mnemosyne, Oceanus, Theia
Consort: Phoebe
Children: Leto

Phoebo: First Generation Titaness
Roman Equivalent: Phoebus
Reference: The Shining, Associated with the Moon
Parents: Gaia and Uranus
Siblings: Rhea, Cronos, Hyperion, Coeus, Lapetus, Crius, Mnemosyne, Oceanus, Theia
Consort: Coeus
Children: Leto

Mnemosyne: First Generation Titaness
Reference: Memory
Parents: Gaia and Uranus
Siblings: Rhea, Oceanus, Hyperion, Theia, Coeus, Phoebe, Lapetus, Crius, Cronos, Tethys, Themis
Consort: Zeus
Children: 9 Muses

Themis: First Generation Titaness
Reference: Order and Law, Of Good Counsel, Lady Justice
Parents: Gaia and Uranus
Siblings: Rhea, Oceanus, Hyperion, Theia, Coeus, Phoebe, Lapetus, Crius, Cronos, Tethys, Mnemosyne
Consorts: Zeus, Lapetus
Children: The Fates, The Hours, Auxo, Carpo, Tallo, Dike, Eirene,
Eumonia, Prometheus

Crius: First Generation Titane
Parents: Gaia and Uranus
Siblings: Rhea, Oceanus, Hyperion, Theia, Coeus, Phoebe, Lapetus, Cronos, Tethys, Themis, Mnemosyne
Consort: Eurybia
Children: Astraios, Pallas, Perses

Lapetus: First Generation Titane
Parents: Gaia and Uranus
Siblings: Rhea, Oceanus, Hyperion, Theia, Coeus, Phoebe, Crius, Cronos, Tethys, Themis, Mnemosyne
Consort: Themis
Children: Atlas, Prometheus, Epimethus, Menoetius

Added (2010-06-27, 3:53 Am)
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Note:

There was once the rule of Uranus and Gaia.
Uranus- The Sky and Father of the Titans
Gaia- The Earth and Mother of the Titans

Then there was the Gigantonomarchy, a battle held of which Cronos overthrew his father and the ruler.

Cronos was infamous for his response to his parents telling him of what will come of him by his own children.
They told him that that his own children would overtake him the way he overtook them.
With this, Cronos then begin to devour his own children by Rhea.
Then, Rhea became pregnant with baby Zeus; she hid him away from Cronos to protect him from being consumed like his older siblings.
Once grown, Zeus got Cronos to hack up his 2 brothers; Poseidon and and Hades.
Together they began the Titanomarchy; an epic battle between gods and titans.
The Gods were just able to defeat the titans and Zeus too over as the king and ruler banishing the titans to the pits of Tartarus.
Tartarus- a pit or void, the deepest part of the underworld (the trashcan of the gods)
Also during this time the rest of Zeus's siblings had been freed.
Zeus and his 2 brothers (referred to in the Percy Jackson series as the Big Three ;D) divided the world into kingdoms they would rule.
Zeus- Ruler of the Sky
Poseidon- Ruler of the Ocean
Hades- Ruler of the Underworld