here's my humble opinion of the best way to educate parents, just for anyone it might apply too:

be respectful of your parent's house rules, if you're living in their home.

Don't slack at school, if you're in school.

Don't screw up at work, if you have a job.

In short, don't do all the stereotypical fuck-up things that people want to associate with pot smokers. Maybe develop a little class, hold down the job, rock the grade curve... Foresight people. It means not doing the things that are obviously stupid in hindsight.