Well, it was more collaborative, really. He's just turned five, so his part of the job was to help with important tasks like holding things, counting timer revolutions, and remembering not to turn the lights on. But he got his first chance to help under the safelight and watch the print come up in the soup, and we all know that's the really magical part.
This quick scan of the print isn't perfect---the real thing is a little darker (really a bit too dark) in the lower right and a little higher in contrast---but I think it sort of conveys the idea. It's certainly not the most exciting photo in the world, but as a parent and a photographer, it was a pretty exciting moment!