My sister gets away with everything because she doesn't stop complaining if not. If she is in a bad mood, WE have to be polite to her even if every five seconds she is telling us how what we are saying is stupid. If she asks if she can have something, she will not stop complaining until she gets it. If she says we are bothering her, WE get in trouble. If we say that she is bothering us, SHE is just told to "Please don't do that next time." And her response is, "I can if I want to." I CAN'T STAND IT.
I apologize for my rant.