What happens to peter Edmund Lucy in Narnia the last battle?

Not to spoil the ending, but they return to Narnia and accompany Aslan to his country, because they are really dead after a train accident in their world. Susan could have returned, but she began to belive that Narnia was a make-believe place as she grew older, and will not come to Aslan's country. All the children reunite with Prince Caspian, the Beavers, Tumnus, and other characters who have died with the ages. They all live there for eternity. The End. Please read The Last Battle by C.S. Lewis, it's really good.