She is the daughter of Zeus and Hera, and sister of Ares, Hebe, Hephaestus, Heracles, and Eileithyia, goddess of childbirth.
Notable Stories Involving Her:
Eris, whose name means "strife," often accompanies her brother Ares into battle, along with her nephews Phobos ("fear") and Deimos ("dread").
Her only known attribute is a golden apple, known as the Apple of Discord, which indirectly caused the Trojan War.
Eris Around the World:
Her polar opposite is her niece Harmonia ("harmony"), and her Roman equivalent is Discordia, though she's also been identified with the Greek war-goddess Enyo.
SOURCES: Greek Mythology.com, Mythweb, Encyclopedia Mythica, & Wikipedia