If she is actually getting mad at you, she may feel you are being careless or reckless. She may think it is time for you to calm down and take your time.
It depends what did your sister do? If she has bad grades okay parents get a little annoyed at that. Did she break something or do something she wasn't allowed to do? Did she (in an extreme case) get pregnant or get aids or HIV or an std? In all of these classes parents will get mad but for the last one, I would be pissed beyond belief, so it would be no wonder if your mom was mad about that
don't ever fight with your mom because thats how you get your mom really mad. Sometimes you don't listen to her or do something stupid
She would hit you because she might have been mad (not at you at something else) at something else which got her so mad that she beat the whip out of you.
He could-be mad if your mom was rude to him. He should not be mad at you over this.
Sometime you just hate your mom because they hited you and you got mad at them. The other answer is because you did something wrong and you got in trouble.
You fall, or get run over by a car or something. Having mad sex will do it too.
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Well it really depends how old he is and i would do is that if he tells you something mean then tell your mom.
follow what she says, listen... don't be a baby about it. she will understand, but you must try to make it better.
Try and be the best person and she will the best mum.
Go to your local library and check out: 101 Ways To Bug Your Parents. Or do something they don't like. I suggest you don't :)