<human>: Ok this is partially for me, and partially for my parents sake too, but my sisters are the two most demanding people I've ever met. The older one is 16 and to be blunt, can be an absolute bitch at times. This ranges from yelling and screaming at 2 AM to wake everyone up because she can't find clothes for school in the morning to constantly twisting things around to make it seem like everyone (mainly my mom) is out to get her over everything. The younger one (8 years old) is a brat, and a human tornado. She demands attention at all times and constantly interrupts. She finds a way to spill or knock over everything she touches, which she the refuses to clean up because "it was an accident." Furthermore, it seems like whenever one of them decides to flip the switch to batshit psycho, the other does the exact same, resulting in an onslaught of noise and screaming about multiple things for my parents to deal with. Both of them can be irrational at times, so reasoning with them and explaining the absurdity of the situation they've put everyone in is out of the question. 
How in god's name do I deal with this? I know it shouldn't be my responsibility, but my parents seem mostly incapable of disciplining either of them. I just want to calm things over and relieve even the slightest bit of stress from my parents' lives and, in the process, mine also.
Sorry about the wall of text. Any help would be appreciated.

Can you condense the text into a few key points?
<bot>: Sisters (16) and (8) are demanding and cause a shitload of stress on my parents and I through incessant complaining, selfishness, and need for attention.