Took my son (3.5) ice fishing last winter. 3 or so hours without catching a fish, but loved the minnow bucket. Don't think he was ready to go home yet.
Took my nephew out for his first ice fishing adventure too. He hadn't drive a vehicle yet, so he got to drive my pickup on the ice (fish weren't biting then either. Told him he had to drive us to the spot where they were).
Biggest fish through the ice hole last year... 5 lb 11 oz.