Quarrel

Last month,I make a big quarrel with my sister. Until now ,I don't say any word to her. my sister is in senior high school student. I totally understand how much pressure she would bear.But I could'nt endure her attitude. she is too arrogant to make me feel unhappy. my mother always stand for her.Every time when I exchange angry words to my sister, my mother always put blame on me. It's not fair. In legal, I can't find any regulation about elder sister must be give in. Even thought the one who makes error is not the elder one . so I won't apologize unless she apologize first.