Primary

• Poseidon Older Brother of Hades
• Poseidon Older Brother of Zeus

Extended

• Hades Father of Zagreus
• Hades Older Brother of Zeus
• Hades Younger Brother of Poseidon
• Zeus Father of Athena
• Zeus Father of Artemis
• Zeus Father of Ares
• Zeus Father of Dionysus
• Zeus Father of Hermes
• Zeus Younger Brother of Hades
• Zeus Younger Brother of Poseidon