The children of Zeus are from a different age than our own, an age long past. The Heroes of the Bronze Age are all in Tartaros now, and each enjoys or endures the rewards and punishments the Immortals have deemed fit. Most of Zeus children lived and died alongside mortal men but some, like the penultament Hero Herakles, now live on Olympos as a reward for their exemplary lives and heroic sacrifices.
For a short list click HERE