The Doctor stiffened, his eyes narrowing. "Know there's a Rose here, knew a Rose in my own universe. Why do you ask?" he asked, a bit defensive. He didn't like any of the possibly implications that the question the man had asked raised in his mind. Was there a universe where Rose had a brother? Or worse, a boyfriend who wasn't useless? Or had the Rose here told this kid he had been an arse, and run away from her?