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And then Father nodded and he didn't say anything for a short while. Then he said "Thank you."
And I said, "What for?"
And he said, "Just...Thank you." Then he said, "I'm very proud of you, Christopher. Very proud. I'm sure you did really well."
Father treasures the one thing Chris is good at: maths. And he takes pride in it. 
And sometimes he tried to talk to me through the door, but I didn't answer him. And sometimes I heard him sitting on the floor outside the door quietly for a long time. 
For what? To accompany Chris, to feel his presence, to make sure that he is there.