However , the twelve as most commonly portrayed in art and poetry were Zeus , Hera , Poseidon , Demeter , Athena , Apollo , Artemis , Ares , Aphrodite , Hephaestus , Hermes and either Hestia , or Dionysus .
Zeus , Hera , Poseidon , Demeter , Hestia , and Hades are all brothers and sisters .