I just have to ask.... Is there anyway that you would be able to sit down with your brother and tell him how you feel?? This might make him realise exactly what he is doing to you and making you feel. You could have a friend go with you so he wouldnt try anything.
I think its disgraceful that your family say ignore it, they make it seem like young brother sister rivalry that happened when you were 5! You are both grown people and both know what is right and wrong! Seems like they say just ignore it in the hope that the problem will go away, it obviously hasnt and something needs to happen. If the talk with your brother doesnt work, maybe you could talk to your dad even though he says ignore it but maybe say something along the lines of.... Dad, can you please stop living in denial and face up to what is happening, he left hand prints on my face, how can i ignore that!?! This problem is not going away and needs to be addressed, I could have him up on abuse charges if nothing is done.