Man that's tough. I had parents like that as well. I was the middle child, where my older sister got to do things and got away with things as well because she was old and my brother got to do things and get away with things because he was a boy. I can tell you this, it will only hurt you to hate and you will be grown soon.
Well, dear its really very sad, but its also very bad to dislike your family. i think you are very concious about their attitude and of course its natural you cant ignore them but i think that the solution to this problem is, you should not pay any attention towards it especially you should not reflect any reaction towards what they are doing, avoid any remarks, spent most of your time outside reserve yourself and answer properly to your family but when they ask something from you. because some how it happens that if you are possessive about some thing you don't get anything in return but if you avoid them neglect them for some time then finally you became successful in achieving that what you require. so try it out. Good Luck
You should try talking to your parents about what you feel. Your feelings of are legitimate. You feel like they are playing favorites and it will if it hasn't already cause you to be resentful against your brother. You really should talk to your parents.
How old are you? Maybe you could get a job or something so your not there so much. Hate is very harsh, and most of the time when you hate, you are the only one who suffers. How old is your brother?