It's not easy but it comes a time when he has to be told the truth. It's his right and his survival might one day depend on it.
The others decided that they won't tell their children, that the past must be forgotten, that we have enough problems as it is and we should focus on today, focus on the future. He has a right to know, he needs to make his own decision if he's going to own his world, build towards a better one or give up on it. I wouldn't blame him..
"Son, there's something you must know about the generation before you, the world you've inherited, the land you're walking. It's noon now, look around.."
"It didn't always look like this. When I was about your age the skies were blue, the sun was shining bright, the water was so clean you could have drank it cold directly from the river and the land grew crops. The bright horizons were teeming with birds, the fields were full of insects that we used to hate back then.. I can't begin to tell you how much I miss them now.."
"We used to live in big houses, owned cars to travel these now broken roads, built machines to better our lives. We had society and rules, smiles on our faces, big family meals, traditions, gadgets, internet.. We build ships to fly and travel great distances, we even put people on the moon.. But you haven't seen the moon, or any of the tings from before and this is why I'm telling you all of this.."
"Society managed to pull through hard times. We had a big war back in the day, we called it World War 2 which showed us both how smart, strong and caring we can be but also how weak, corruptible, sick, greedy and evil."
"We discovered the power of the atom and we immediately started using it to destroy ourselves by building these devices that had the power to wipe out cities in the blink of an eye. We used a couple of them and many died, it was a tragedy, but the world understood right then and there that we must never touch those devices again."
WE DID!