How do you deal with a bratty 8-year-old? She is bugging the hell out of me. She is so whiny and bitchy, and I just want to punch her in the face, but I can't do that because then I'd be an asshole. She has been like this all freaking day.

Last night, I went to my dad's house. He had work today, and we didn't have school, so it was agreed that I would be in charge this morning while my dad and grandparents were at work. Before I woke up, my sister was to do something quiet. She did not. Instead, she had the TV on at full blast. I only had like, 3 hours of sleep, so I stumbled out into the living room and asked her to turn it down. She would not comply, and I got pretty mad. I am not a nice girl when I am sleep deprived.

Me: What's this noise?
Brat Sister: I am watching TV!
Me: Turn it down a little? Please?
Brat Sister: ((turns it down one notch))
Me: That's not enough...
Brat Siser: UHH, YOU DON'T TELL ME WHAT TO DO!
Me: ((storms over to TV and turns it off)) YOU FREAKIN' LISTEN TO ME, OKAY? I'M IN CHARGE THIS MORNING. I AM SO SICK OF YOUR CONSTANT "BAWWW BUT YOU'RE NOT THE BOSSSSS" WHINING BECAUSE SOMETIMES I AM THE FREAKIN' BOSS. UGHHHH.
Brat Sister: S-Sorry...

I went back to sleep and woke up a few hours later. I had to go back to working on my term paper, so I asked her not to bother me while I was working since she's super loud. Still, she barged in and refused to leave because "YOU'RE NOT THE BOOOOSSSSS! YOU DON'T TELL ME WHAT TO DOOOOO!"

Every time I'm left in charge of her, she refuses to listen to me and instead just beats the hell out of me every time I say something she doesn't like, which is basically every time I make a decision about anything. I'm about ready to call Supernanny on this disgusting little bitch. She tried to hit me with a motherfucking GOLF CLUB. Then, she tried to slap me, so I deflected it, and she hurt her hand and started crying. Now she's throwing toys at me because I called her "little girl." ('I'M NOT A LITTLE GIRL, I'M A PREEETEEEEN!") She's spoiled as hell, and I just can't wait for somebody to bitchslap her into the stratosphere one day.

This child honestly makes me feel violent. She also makes me want to hide under the bed and cry. The only person that has any power over her at all is our mother; our dad and grandparents can't seem to get through to her at all, and I sure as hell can't. And of course, our mother is the only one who doesn't think there is a problem! When I try to talk to my mom about it, she thinks I'm just being mean and should "try to understand the baby more." It pisses me off so much.

I talked to my grandma about it tonight, and she says she's definitely noticed an increase in this kid's brattiness too. She can't control her either, though, so there's nothing we can do about it.