"Wait, what? Pause, rewind!" I said, dumbstruck. "Harry Potter my brother?"

"Yes, yes," Grandmother said, looking slightly annoyed. "Your name is really Olivia Rose Potter. At least, that's what it says on your birth certificate. And I am legally Dorea Potter, at least, after I married your grandfather. And you and your brother are both children of Lily and James Potter."

"Wait, but his—my parents died after You-Know-Who came! How could I be his younger sister?" I said.

"Ah, I knew you would get to that, Olivia. You've always had your mother's brains. Well, you see, Lily was three months away from having you when Voldemort—" I flinched visibly. "Olivia, never have I ever! You, of all people afraid of a silly name! I never want to see you afraid of his name again. Say it with me now." Grandmother ordered firmly.

"V-Voldemort." I said softly.

"Now, as I was saying, Voldemort killed your mother, but obviously failed with Harry." She said bluntly. "But, you, inside, were still alive. Just barely, but still alive."

"How?" I interrupted. Grandmother glared at me. So much for being nicer.

"I shall get to that; now be quiet and listen. As soon as Professor Dumbeldore—your headmaster—heard, he rushed to the house, to find Harry bawling, your mother next to him, and y-your father in the ruins of the house." Grandmother blinked rapidly. She must have really loved my dad. "Hagrid—your Gamekeeper—was ordered to take Harry to your mother's sister's house. They're Muggles. Your mother was Muggle-born; I didn't really care, but ever since, my original family, the Blacks have regarded us as blood traitors. Ah, well, what can you do? Anyway, Dumbledore did some hocus-pocus on you and you were born. Barely alive, tiny, and weak, he sent you immediately to St. Mungo's. After Hagrid and Dumbledore dropped Harry off, Dumbledore went to check on you. St. Mungo's had cured you so you were a normal baby. He immediately sent you to me. He knew Petunia Dursley would have enough trouble with taking in her nephew, but to take in her niece too, that would be crossing the line."

The entire time, I had been staring at Grandmother. How could this have really happened?

"Well, then, he explained to me everything that happened. And the only matter left was naming you. Dumbledore vouched to name you Lily, after your mother, but I refused. I-I remember the last time I saw your parents."

Grandmother's voice shook. I was shocked to see a tear roll down her wizened cheeks.

"Harry was playing on the floor, and they were about to leave, when I stopped them. I asked what they were going to name you. Lily said immediately 'If it's a boy, Chance Sirius, because we took a chance with having another child and Sirius, after well, Sirius.' But then James had said 'And if it's a girl, and I'm pretty sure, because I can tell, then we're naming her Olivia Lily.' Lily had shook her head. 'Oh, no, definitely not Lily anywhere in it. It's like I would be d-dead and they named her as a memoir.'" Grandmother choked with emotion. "And then she suggested Rose as your middle name, to carry on her and Petunia's tradition of flower names. And I told all this to Dumbledore when he came, and he agreed. You were to be named Olivia Rose Potter, after your parents' last words to me."

Grandmother and I looked at each other, tears rolling down both of our cheeks.

"I had no idea." I whispered. "That anyone went through this much trouble for me."

"Olivia, I know I may have been hard on you, but that's my way of showing I love you. I want you to become a strong, respectable woman just like your mother. And I can only hope that Harry grows up to be as brave and determined as your father." Grandmother trailed off.

"Two questions: Why didn't Harry stay with us?"

"He needed a normal life, away from wizarding questions. Imagine how arrogant he would be!"

"Well, then, why tell me this now?"

"Well, you're going to be seeing each other at Hogwarts, anyway, and since they have your name down as Olivia Rose Potter, your names will be right next to each other. Everyone knows about you but you, Olivia."

"Wait, really? Am I as famous?"

"Almost."

"Wait, is Harry in my year?"

"Oh, yes, wasn't that implied?"

"But, won't this be a shock to him, too?"

"Well, seeing as he is being raised by Muggles, and they have no idea about you, then yes, yes, it will." Grandmother said stiffly.

"But I would have to explain everything to him!" I said, perplexed.

"You're smart enough." Grandmother said simply.

"Why don't you explain it? I'm sure Dumbledore would let you stay for a while to explain to Harry…he is after all, Harry Potter. Some exceptions should be made." I said, crossing my arms. I mean, really! How was I supposed to explain to him that I was his sister?

"Olivia, please. You are his only living family and—"

"Oh, really? Then what are you? Chopped liver?" I said haughtily. Grandmother gritted her teeth, using all of her self-control not to explode at me.

"No. I mean you are his sister, for Merlin's sake! Just do this one thing for him!"

"Gra—"

"No. Go and pack your things. You are leaving tomorrow where you will tell him you are his sister."