Emergancy! help?

Hello. My husbands stepmothers father is in the hospital. He had two anurisum. They were able to stop one but they cant find the other and it continues to bleed. He is not in good condition at all. His brain is dieing and his blood pressure is droping plus He has a machine breathing for him. Im not a doctor or anything but i know my medical stuff because of my mother. They have told the docs to revive him if he stops breathing or his heart stops. I have a big problem with that. The guy will never be his self. He wont beable to breath on his own or anything. I have be trying to stay positvie but its hard when you know what is happening. How can I talk to them about this and get them to under stand that hes not going to get anybetter and that he wouldnt want to be on meachines. It hurts me to say this. It really does. I just dont want to see him put through this.