[pasbesoin]

Bet they use the TV and are used to it. Get a Raspberry Pi (and keyboard and mouse and controllers), show it to them, plug it in. In whatever order: Play some games. MODIFY a game. Install/run a good LOGO variant (once they read enough to use it). Show them some neat LOGO programming. Help them make their own LOGO programs. Leave them alone to make their own stuff.

Consider Scratch or another "kids" environment, if/when LOGO doesn't seem to be enough.

When they are up to it, help and/or encourage them to make their own games. Or whatever -- if games turn out not to be their thing.

So, you take a TV that is passive. And you make it active. With this cool and tech and not "packaged" looking PCB. And you show them how it can do what they want -- if they can figure it out.

And, don't forget to go out and ride bikes, too.

P.S. The computer is not magic, and it's not a fancy TV. It's a tool. It'll do whatever you want, if you can figure it out.

P.P.S. For bonus points, when they become a teenager, turn them on to the paranoia of the war on general computing. ;-)