The birth order of Zeus and his siblings is based on Greek mythology, specifically the story of the Titan Cronus and Rhea.
Cronus swallowed each of his children at birth to prevent them from overthrowing him, as foretold in a prophecy. Zeus, the youngest, was hidden and later freed his siblings. Here’s their birth order:
Hestia: The eldest and the goddess of the hearth and domesticity.
Demeter: The goddess of agriculture and fertility.
Hera: The goddess of marriage and Zeus’ eventual wife.
Hades: The god of the underworld.
Poseidon: The god of the sea.
Zeus: The youngest and the god of the sky, who ultimately overthrew Cronus to become the ruler of the gods.
Though Zeus was the youngest by birth, he became the leader of the Olympian gods after freeing his siblings from Cronus’ stomach.