This question seems to be incomplete. Nevertheless, there is enough information to find the right answer.
Answer:
While the grandfather was alive, the rest of the people didn´t talk much to him, and the grandson was the only one that would talk to him. Then, when the old man dies, the other people cried and sobbed, but the grandson did not. Instead, he just waved to his grandfather and felt sad because he wouldn´t return the gesture.
Step-by-step explanation:
In "Leave – taking", by Cecil Rajendra, the grandson and the grandfather seem to have a special relationship, which leads the boy to act differently from others while the old man is alive and when he dies.