OP while I feel for you, and the situation you are in...i think maybe this isnt the right way to vent or express your frustration.
I know how hard it can be being crammed into a house with small children and not enough space. Lots of noise and lots of chaos.
Heck I have a hard time just going home at christmas to see my family. Don't get me wrong I love them all but...i was out of the house on my 18th b-day on my way to boot camp....and after 2 1/2 years in the military with discipline etc going back to screaming children and family fueds is NEVER easy.
But if theres a problem at home....deal with it at home. Coming on to a public forum and throwing insults about your sister and your other family members is NOT the best way to go about it.
We obviously don't know whats going on at home. We arent entitled to it but if you come on here insulting right of the bat...we are going to form opinions based on jsut waht youve given us and we can't be blamed if we don't know the full story.
Its probably not easy for your sister having kids to take care of. Especially in this economy and maybe she needs some extra help.
The best thing for you to do is talk to her about it. Tell her wahts going on with the kids and how its stressing you out. Maybe see if you can move in with a friend or another family member while you try to build up some money to move out on your own.
But coming on here, and gossiping/insulting your family is not constuctive to helping solve this situation.