Lily Potter was a muggle born witch and the youngest person in the family (Petunia being the oldest.) She learned she was a witch when a boy Severus Snape recognised her magical abilities and told her about the wizarding world. They became friends until Snape joined the Death Eaters. She was sorted in Gyriffindor house and was a favourite student of Horace Slughorn, she was made Prefect in her 7th year.
After Hogwarts, her and James Potter married and had a son Harry Potter. After being told she had given birth to the chosen one, the one to vanquish the Dark Lord, they were forced into hiding and they were betrayed by Peter Pettigrew. Lord Voldemort murdered her and James on the 31st October while protecting there son. After the Second Wizading War Lily had three grandchildren through her son Harry Potter : James Sirius Potter, Albus Severus Potter and Lily Luna Potter.