Io

Io is the deuteragonist of Clash of the Titans and mentioned in Wrath of the Titans. She acts as one of the two love interests of Perseus (the other being Andromeda)

Family

 * Perseus (husband)
 * Helius (son)
 * Zeus (father-in-law)
 * Danae (mother-in-law)
 * Acrisius (stepfather-in-law)
 * Poseidon (uncle-in-law)
 * Hades (uncle in law)

Trivia

 * The second one implies she died in childbirth