Please, don't "work" on your son. The last thing he needs is to think that he's obligated to participate in dad's hobby. If/when he shows an interest then guide but don't press him. Pressing can only leave a bad impression of amateur radio on him if he clearly is not interested. Enjoy your participation in the hobby and perhaps he'll find it interesting in its own right. If so, great, if not, don't let your ego get bruised.
Also, amateur radio appeals to those interested in radio for radio's sake and experimenting with technologies on top of that. Comparing it to commercial telecom services really does amateur radio a disservice. The two aren't even in the same universe. Let's get away from repeating the mistake of comparing amateur radio to commercial services.