Since when

Niwa?

I was just sitting outside watching the others train when I sensed someone sneaking into the house so I went inside to investigate and i saw my sister.she went to kill alpha i grabbed her making my grip on her right hand tightened and she dropped the knife "let me go!"she demanded but i had to many questions when she refused i knocked her out with wolf ban and put her in her room. Next thing i know we were being attacked by rouges when she ran out. She started helping. I was shot last thing i remember was her yelling my name "scar!" she shouted as i blacked out)