Since there are so many relations, I have decided to make a whole family tree, and I will explain who everyone is and how they are related and the very complicated relationships between each immortal. The next part will be how the characters are related.
Here is the Greek Family Tree Everything will Be Based On
The main relationships to focus on:
Hestia, Hades, Poseidon, Zeus, Hera, and Demeter are all brothers and sisters
Zeus and Demeter are parents of Persephone
Zeus and Hera are married
Zeus is the father of Athena and Metis is her mother
Zeus and Hera are parents to Ares, Hebe, and Hephaestus
Zeus and Semele are parents to Dionysus
Leto and Zeus are parents to Artemis and Apollo who are twins
Atlas, Prometheus, and Epimetheus are all children to Iapetus and Clymene
Atlas and Pleione are parents to Maia and six other daughters
Maia and Zeus are parents to Hermes
Epimetheus is the father of Dione
Dione and Zeus are the parents to Aphrodite, however, Aphrodite was also born fromm the foam that floated when Kronos castrated Ouranos and threw his genitals into the sea how lovely!
To break it down even further:
Ares, Hebe, Hephaestus, and Athena are all technically siblings
Poseidon and Hades is the uncle to Athena, Ares, Hebe, and Hephaestus
Demeter and Hestia are the aunts to Athena, Ares, Hebe, and Hephaestus
Still with me?
Hera and Hestia are both aunts to Persephone
Poseidon and Hades are both uncles to Persephone
Dionysus is the half-brother of Hephaestus, Hebe, Ares, and Athena
Dionysus is the youngest of everyone
Is your brain okay still? No? Oh boy, well trust me, it wasn't easy writing all of this lol
Hestia is the oldest of the Olympians followed by Hades, then Poseidon, then Hera, then Demeter, and Zeus is the youngest of the six.
In order from oldest to youngest out of ALL of the Olympians it goes:
Hestia
Hades
Poseidon
Hera
Demeter
Zeus
Aphrodite
Athena
Ares
Hephaestus
Artemis and Apollo (Artemis is technically older :P)
Hermes
Dionysus
I'm sure you all have a headache by now, but don't worry, the demigods list will give you an even bigger headache!