
For The Gambit, it is all lights, all the time. He has a sixth sense for the location of every switch in a room, and must immediately determine which light it’s connected to. (He does this with Uncle Wookiee, anyway, whose name is “Up!” as far as The Gambit is concerned. Auntie Robin don’t play that game.)
We had an interesting time at a local furniture store recently. An oven was set up, mercifully unplugged. The Gambit immediately started pressing the buttons. “On!” Then he’d check the overhead light, the table lamp, the halogens, everything. “On!” Finally, he sighed in frustration — then noticed the giant window, looking out on the city. He ran over to said window and pressed his face against it, checking out all the skyscrapers, lit up in the dark. Then… he went back to the oven, pressed the button, said “On!”, and returned to the window to see which skyscraper’s lights were connected to the oven switch. All buttons are connected to lights, you see; it’s just a matter of determining which one.
This kid is scary smart. He’s going to outlap us all soon, unless his brain completely shorts out from all the Christmas decorations. (“Light! Light! Light! Wow!”)
I haven’t started explaining about The Rogue yet. I’m not sure how; there’s lots of “baby sibling” books out there, but that doesn’t really apply. I suppose I’ll figure it out sooner or later… or just deal with the meltdowns when they arrive.

That’s hilarious, and almost always the case. Switches and buttons are generally connected to lights. Sometimes two, if you’re lucky.
Hopefully not two. Too many variables will blow the poor kid’s mind.