The Twelve Olympians: the list, and where each god's parentage is attested

The canonical twelve gods of Olympus — Zeus, Hera, Poseidon, Demeter, Athena, Apollo, Artemis, Ares, Aphrodite, Hephaestus, Hermes and Dionysus (or Hestia) — with the primary passage that gives each one's birth and parents, and the two places where the ancient witnesses disagree.