Antigone loved her messed up, incestual family. They say blood is thicker than water. She believed no matter what her brothers did, they BOTH deserved a proper burial and an afterlife. She was a rebel and disobeyed the King, giving her brother burial rituals. She knew all along that she would get busted for her deed, but she did it anyways. Her punishment for this was being encased in a cave with a set amount of food, surely to die. Before King Creon changed his mind, she committed suicide because she knew she was going to die anyways.