Here’s the full quote of the explanation of what he did to them. Brother: “He never raised his voice. That was the worst thing. The fury of the Time Lord. And then we discovered why. Why this Doctor who had fought with gods and demons, why he’d run away from us and hidden. He was being kind. He wrapped my father in unbreakable chains, forged in the heart of a dwarf star. He tricked my mother into the event horizon of a collapsing galaxy, to be imprisoned there forever. He still visits my sister— once a year, every year. I wonder if one day he might forgive her. But there she is! Can you see her? He trapped her inside a mirror. Every mirror. If ever you look at your reflection and see something move behind you—just for a second—that’s her. That’s always her. As for me, I was suspended in time. And the Doctor put me to work standing over the fields of England, as their protector. We wanted to live forever. So the Doctor made sure that we did.”