This is quite interesting, as the people I've spoken to that have kids generally speaking have less than positive or any experiences to speak of. I've been told that either their kids aren't at all interested in tools/projects, the parent's either lack the patience, time or in certain cases, the Mother doesn't want the kid to be involved in anything "dangerous".
To be fair, some work is dangerous and shouldn't be done unless you absolutely have the right knowledge of what you are doing. Personally speaking, I am not willing to risk my life or the lives of others to save a few dollars. By no means do I have a infinite amount of cash, but I've learned from experience what is within my realm of knowledge and when this time to have a licensed professional do the work.
But I also, can see how this was be exceptionally frustrating trying to teach a person that has no interest in the subject. Been there myself and sometimes success happens and sometimes this is best to move on. Sure there are variances, yet in the end, a person must have the desire and the motivation to go forward.