How to get my cousin to leave me alone?

I hate it so much, one she's older than me (weird right?) and two she's so annoying. I'm 14 and i live with my mom and grandma (small *** house).It's ridiculous! Her 5 year old sister(also my cousin) runs yelling around the house and i can't take it anymore. And she's 18 without a phone and always just takes my phone and goes an fb or whatever. I'm too nice but i'm gunna go off soon. To top that off she dropped my phone which cracked because its an iphone. And to top off dropping my phone, she's going to be living here. My life sucks right now. Her father(my uncle) just brings my little cousins over and they eat all the food and we barely have any money to buy more. They are here nonstop and its driving me and my mom and grandma crazy. She's on the bed with me as i type this using my phone. She won't get out even though i tell her i have homework to do. Its so frustrating because she knows she's annoying me and she even asked and i said yes. Please help me i'm dying and need my own space.

Added (1). Haha my iphone is really old its a 3gs which i got for my birthday a couple years ago. Things have gotten really bad since then so yeah.

Facebook iPhone App - Problem (s)?

1. When i'm on the app it doesn't say I'm on chat?

2.It doesn't have the phone icon to say i'm on my phone?

Yes I have the latest version.
I have rebooted etc.

Please can somebody help me?

Charge iPhone 3GS with iPad charger?

I just realized the last two times I had hubby plug in my iPhone 3GS to be charged, he plugged it into the iPad charger. The battery charged both times. Is it OK to do that, or will it eventually kill my battery/phone?

How to move icons on iPhone 5?

Attempting to rearrange order of icons on main screen of new iPhone 5. Several are now down on bottom line and can't be seen unless I double click and then scroll across. How to move them into plain sight?

Iphone off not switching on?

I have an iphone 4g. I put it on charging and it switched offf all of a sudden. It won't switch on. I'm very worried please help if you can

Need new Iphone but in middle of AT&T Contract?

My Iphone 4S was lost or stolen. I went to Best Buys and they said it would cost $600 for a new because I was in the middle of my contract. I went to AT&T, and they said I could purchase a ghost line to my existing account for an additional $20/mo for 2 yrs plus the cost of a new Iphone ($100-200) depending on Iphone series. I do not want to pay more then $200 for a new Iphone. Can anyone offer other suggestions? Wants: Must be Iphone 4S or greater and I want to keep my old number.

Added (1). It would be $250 to buy out my contract. It was my understanding I could keep my new number with ghost line. Will they let me cancel my contact and buy new phone with existing phone number?

How to find my stolen iPhone?

I don't have the find my iPhone app. But i have the box it came in with the serial numbers. And i don't have insurance