I worked for my father at his glass company for 12 years. I learned more from him than anyone else. We had a great working relationship and the teaching didn't stop when we left for the day. I'm not there any more because the glass business isn't for me. While I'm sure he was bummed that he couldn't pass it on to the third generation (though he'd never admit it), he totally supported me when I made the decision not to go further with it.
Shameless plug, but if you're in Nashville and need glass, hit up http://evansglasscompany.com/