Why must i have a dumb n act smart sister

Today i n the morning was a fine and i thought that it was going to be the best day ever. But when the sky turn back, fight being happening in my house.

Why can't my sister be more sensible????
Why is my sister not as matured as her frens???
Why can't she stop acting smart n think she is always rite???

All this problem with my sister Coz me turn crazy today...... ( after reading this post plzzzzz tell me who is wrg in my chatbox).

Is was when my mother opened a packet of sweets which we bought from marks & spencer... ii bought the packet of sweets into the computer room. whe n i took the 1st sweet, my sister saw and when i took the 2nd piece, she instantly took the sweets away and acused me for taking three and when i thought of giving in toher but she went to hit her and i hate her for punching me and acused me for no reason so i hit her on her cheeks and it bleed abit..
he worse part is that tmr i'm going my cousin house and stay ..
So my mother went to canael it..But after my reasoning, she agreed that it was her fault...