It was at this age that you really started to notice things. You noticed how different Sister #2 acted from everyone else. You noticed the different types of fits she had.
You noticed the way Brother acted towards you. Hateful and rude. He hadn't really ever shown affection towards you.
You had gotten used to the harsh treatment at school- that doesn't mean you didn't cry though. You honestly cried all the time.
At this age your brother started to tell you hurtful things. Things such as you're useless, annoying, ugly, and whatnot. Of course you didn't believe any of this at the time.