"And then ... and then when they _were_ identical boys, he was very sensible about it. He was always so sensible. 'We'll call them Martin and Bartholomew,' he said. 'Then if they want to call themselves Mart and Bart, they can, but they won't be stuck with any rhyming names if they don't want them.' Jim was always very thoughtful that way, Doctor. Very thoughtful." She seemed suddenly to realize that she was crying and took a handkerchief out of her sleeve to dab at her eyes and face. "I'll have to quit crying," she said, trying to sound very brave and very strong. "After all, it could have been worse, couldn't it? I mean, the radiation could have killed my boy, too. Jim's dead, yes, and I've got to get used to that. But I still have two boys to take care of, and they'll need me." "Yes, Mrs. Stanton, they will," said the doctor. "They'll both need you very much. And you'll have to be very gentle and very careful with both of them." "How ... how do you mean that?" she asked. The doctor settled back in his chair and chose his words carefully. "Identical twins tend to identify with each other, Mrs. Stanton. There is a great deal of empathy between people who are not only of the same age, but genetically identical. If they were both completely healthy, there would normally be very little trouble in their education at home or in school. Any of the standard texts on psychodynamics in education will show you the pitfalls to avoid when dealing with identical siblings. "But your sons are no longer identical, Mrs. Stanton. One is normal, healthy, and lively. The other is ... well, as you know, he is slow, sluggish, and badly co-ordinated. The condition may improve with time, but, until we know more about such damage than we do now, he will remain an invalid." He had been watching her for further signs of emotional upset. But she seemed to be listening calmly enough. He went on. "That's the trouble with radiation damage, Mrs. Stanton. Even when we can save the victim's life, we cannot always save his health. "You can see, I think, what sort of psychic disturbances this might bring about in such a pair. The ill boy tends to identify with the well one, and, oddly enough, the reverse is also true. If they are not properly handled during their formative years, Mrs. Stanton, both can be badly damaged emotionally." "I ... I think I understand, Doctor," the young woman said. "But what sort of thing should I look out for? What sort of things should I avoid?" "First off, I suggest you get a good man in psychic development," the doctor said. "I, myself, would hesitate to prescribe. It's out of my field. But I can say that, in general, most of your trouble will be caused by a tendency for the pair to swing into one of two extremes.