What should I do about my stupid, annoying sister?

Here's the story:
I am the oldest and I have two younger sisters that I am babysitting today. Anyway, they the youngest is fine but the older of the two is extremely annoying, a snitch, always in other people's business, and is so self centered it's not even funny.
So, whenever I baby-sit my sisters and the youngest or me does something that the oldest sister doesn't like, she calls my parents, complains, and my parents get really mad at me and my youngest sister! I mean why can't my stupid sister just grow up?! She tells everyone what to do and she is a total snitch about everything! I am out of patience! What should I do to resolve the whole sister thing?
Oh, and don't give me any answers like just unplug the phone lines. I've already tried that and it didn't work and I'll report you if you give me that answer!

How old are you three?

There is one in every family, kiddo. That's just the dynamics of the beast. Every family has a brat.

This is a situation in which the whole family must get involved. Your parents need to sit down with all three of you and discuss what is right and wrong about snitching. They need to explain that when one person does it just to see someone get into trouble that is just as wrong as whatever the other person has done.

Your parents need to set some ground rules and your sister should have to face consequences if she breaks those rules by telling on her siblings just to see them get into trouble.

Now, having said that, you also have to understand there are times when telling on someone is the responsible thing to do. Your parents need to be the ones who lay out those family rules also.

You need to talk to your parents about this situation and ask them to please intervene before your relationship with your sister is ruined. If you approach this in a reasonable and mature manner you should be able to express your case well to them.

Look, they already feel you are responsible enough to babysit the little monster, so show them you are responsible enough to deal with the situation. Talk to your folks!

Ignore her.

If you react to her she will kep doing whatever she can to get you to react.

Punch her in the face. =)

Talking probably wont work with her, so you should probably show a little more authority around her, and your parents. I bet its also hard being the middle child though, so shes just wanting to get you in trouble for attention and her satisfaction.

Tie her up, your parents will be mad at you but from what you have said they will be anyway.

the older of the two might be a little jealous of you. and she snitches because she is insecure. the only way that you will ever be able to stand her is to find something she likes to do and join her, but in the meantime you are really in charge

maybe making jewelry crafts anything to keep her mind busy

she probably doesnt mean to be that bossy

ask your parents to read this and then say now can we talk
because they will understand it a lot better than you trying to explain anything.

I had 3 little sisters I had to babysit and if they did not mind my mother would come home and spank me for not making them mind. can you believe that
so love and prayers go to you and your family

Well you need to sit down with your parents and get them to wake up and understand what she's doing. Explain to them that when they react with anger at YOU when she calls them that they make it impossible for you to babysit with any leadership or influence. They have to understand that or nothing else is going to work.