Nobody can quite push your buttons like your siblings (or parents, for that matter). They know you for too long, and they understand on a very deep level what will annoy you, and what won't matter to you at all. Can't live with them, can't live without them. One kindhearted hospital worker shared that she was fostering a little girl she had treated after she'd arrived with all sorts of injuries. After the little girl recovered, the worker took her in, hoping to adopt her. She cooked for her, go…