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There was Chaos. Out of Chaos came Gaea, Tartarus, Eros, and Erebus. Out of Gaea came the Titans, the Cyclopes, and the hundred handed ones. The Titans had children. They were Leto, Hestia, Hades, Poseidon, Zeus, Demeter, Hera, and Iaeptus (also known as Bob). Athena came from Zeus's head. Zeus and Hera's children were Ares, Hebe, and Hephaestus. Demeter and Zeus's child was Persephone. Leto and Zeus's children were Apollo and Artemis. Out of Iaeptus came Atlas, Prometheus, and Epimetheus. Out of Epimetheus came Dione which had Aphrodite with Zeus. Out of Atlas came Maia, the mother of Hermes.
By the way, this is a simple family tree, and does not include all gods and goddesses.