[sky black swordman]

^ Thanks for the heads up, @Shinon.

Also I notice something while re reading volume 2;

Spoiler for The Black Swordsman:

But she wanted to ask about Kirito's little sister, whom he said was like her. She wanted to know if Kirito wanted something from her as a little sister.

"...We weren't...all that close..."

Kirito started talking.

"I said that she was my little sister, but she's actually my cousin. Because of some circumstances, she grew up with us ever since she was born. She doesn't know this though. Well, maybe it's because of this... but I kept distancing myself from her without really meaning to. I even avoided running into her at home."

Kirito parents(Kirigaya Minetaka and Midori) are his aunt and uncle.
So did Kirito lie to Silica here or did the author mess up?