 The changes that Ninian make in Martin's life
No one, least of all Martin, could dispute that a man's life should be guarded by his kin—but by those who hadn't been born yet? Nobody in the neighborhood was surprised when Martin's mother disappeared and Ninian came to take care of him. It was safer with Ninian, though, because when he pushed her too far, she would cry instead of mopping up the floor with him. "He's dissatisfied with the current social order and killing you is part of an elaborate plan he's formulated to change it. One day the truant officer came to ask why Martin hadn't been coming to school. But Ninian didn't know that and she went into a real tizzy, babbling that Martin had been sick and would make up the work. When it became clear that his mother was never going to show up again, Ninian bought one of those smallish, almost identical houses that mushroom on the fringes of a city after every war, particularly where intensive bombing has created a number of desirable building sites. Martin was told to call him Uncle Raymond. There were hot water and heat all the time and a freezer well stocked with food—somewhat erratically chosen, for Ninian didn't know much about meals. Though they were in the house with him, in their minds and in their talk they were living in another world—a world of warmth and peace and plenty where nobody worked, except in the government service or the essential professions. It was then that Martin began to realize that either the whole lot of them were insane, or what Ninian had told him at first was the truth. When Martin was sixteen, Raymond took him aside for the talk Ninian had promised five years before. And, on those worlds, it's far cheaper to use native labor than to ship out all that expensive machinery. I don't mean in the now for me, but the now for you," Martin explained laboriously. "I'm trying to talk to you as if you were an adult," Raymond said, "but if you will persist in these childish interruptions—" "I'm sorry," Martin said. In that way, there would be no space-drive, and, hence, the Terrestrials would never get to the other planets and oppress the local aborigines. Martin had, of course, no illusions on that score; he had learned long ago that nobody did anything for nothing. Induced , Martin knew, could have meant anything from blackmail to the use of the iron maiden.
 make Martin uncomfortable and long for his "old life" even though it may not have afforded him the same luxuries of his "new life."
 serve to do nothing other than send a perpetual beacon into the future to let Conrad know where to find Martin.  do nothing rather than offer her creature comforts and show Martin what he has to look forward to.  make other descendants want to come to the past to meet Martin because they will not only have a cause to uphold, they will also have everything they are accustomed to in their life.  make Martin uncomfortable and long for his "old life" even though it may not have afforded him the same luxuries of his "new life."