Smart man and boys you have... Mora knives are great Swedish knives and inexpensive. I have one myself.
What really got me laughing was that my husband took the boys to Chicago in Sept to a big machine tooling show, and they ALL wore their knives on the subway, where it's clearly posted not to. Just out of forgetfulness, really. But as he pointed out, it would be pretty stupid to disarm yourself and draw unwanted attention at that point. Because of course the ones that stay armed usually aren't the law-abiding ones, right?
Anyway, we're all such rednecks out here in the boonies of Indiana it's not even funny.
And I forgot to add, that when mother disarms her sons of their knives as punishment, they still do keep their fists. Or feet. Or conduit/duct tape rifles, or wooden swords, or twine string, or sticks, or rocks, or scissors, or water, or rotten vegetables, or brushes (don't ask. Please.) My boys will NEVER have to worry about being unarmed. They're quite creative.