The father sounds like a sociopathic little man. The poor son learned nothing about the potential dangers of drug use, or the moral consequences of disobeying one's elders. Instead, he was taught that love is conditional, and that malicious, vindictive revenge is a parental teaching tool. Oh, he's probably not yet consciously aware of the new lessons he picked up from Daddy Dearest. But just wait until he has a child of his own who errs in some way. I could just see him doing something similarly vindictive, like ripping up his child's school yearbook, or "accidentally" dropping his child's music-player or phone into the bathtub or a pot of water or something.