My son didn't show any emotion or ask any questions either when we told him and he was 10 at the time. However, there are times when he will tell me that he's stupid and feel really depressed because there is something wrong with him. I'll try to talk with him about it, but he doesn't really want to discuss it. We have also taken him to his psychologist, and he has opened up a little to her about it. He says he likes going to see her, and that he thinks she helps him understand better.
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A foolish consistency is the hobgoblin of small minds. ~ Ralph Waldo Emerson