Before Lily Potter's death, She left her second daughter in the hands of her best friend in hopes he would protect her daughter from all harm, After Severus's lover died he learns the truth of the child he was left with.
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Harry Potter is brought up by his mother, Lily Potter, who is also the minister of magic. His father was ruthlessly murdered, leaving him alone with his mother and sister. But things changed when he got his Hogwarts letter. And they changed even more when he bumps into a girl in Diagon Alley, who was coincidently the daughter of Harry's favorite singers.