Hey everyone.
To start off, I must say, she's the worst human being in the world.
She spits at me, she swears, she pulls my hair, she throws things at me, hits me things, gets me in trouble for who knows what, and throws tantrums here and there for the most idiotic of reasons.
Just being around this person makes me want to kill her, then myself.
Usually, I'm the peppy nice guy that just wants everything to be good in the world, but with her, I'm the psycho murderer with a single target, her.
I can't do anything to her for 2 reasons:

1. I'm the older brother.
2. She's family.

oh, and,
3. I'll get in trouble.
Even worse, she's only 7.
And last week, she tried to stab me with a knife, then when she missed, tried to chop me up with a butcher knife.

Please! Anybody! Help me!