What do you think would be a good way to explain death to a child, from a Buddhist perspective? When a young child hears that someone died, it's natural for him to wonder whether he'll die too, or whether those who are most dear to him too die quite unexpectedly. So what kind of a response should one give in keeping with a Theravada Buddhist Perspective?
Use a tree as an example. Show the various stages of a tree from seed to plant to fully grown tree to an old leafless tree and explain the ageing and impermanence. Then show a decayed/dead tree that is on the ground to make him understand that everything that begins must end. You can use pictures for this. Then explain the life of an animal in the same way. And then explain how humans are the same way. 

Finally, show a seed of the dead tree and show how a new plant comes from it. Use that to explain rebirth.