 By all accounts, Martin should be grateful for the descendants,
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. Martin was told to call him Uncle Raymond. When Martin was sixteen, Raymond took him aside for the talk Ninian had promised five years before. But he wasn't, for by now he had little respect left for any of his descendants. 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.
 but he is unappreciative of the lifestyle they bring to him because he would rather have things the way he was accustomed to.  He sees that even though his lifestyle was rudimentary in comparison, it was genuine.
 yet he resents them.  He rebels against the new way of life they try to petition upon him.  and he is.  He is appreciative of the fact that they want to make him an integral part of securing their future way of existence.  and he is.  They have introduced Martin to a much better lifestyle than he was accustomed to.  but he is unappreciative of the lifestyle they bring to him because he would rather have things the way he was accustomed to.  He sees that even though his lifestyle was rudimentary in comparison, it was genuine.