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I definitely think your concerns are valid. While, according to what you've said, Simon has never hurt your granddaughter, it sounds as though he is experiencing some problems that leave him unpredictable and unstable emotionally, and, of course, that would be concerning to you. The symptoms that you describe in him leave me wondering if perhaps he has a history of sexual and/or physical abuse as these are very common behaviors shown by kids who have been abused. I hope that you and your family are able to get him the help he needs (probably with a child psychologist) to keep him and everyone else safe.