Semi-sucks. If you study the effects of weed on brain chemistry, however, you'll find out that a developing brain suffers a much more severe impact from weed. Especially the ability to transfer information from short term to long term memory. This hinders your learning abilities and also reduces your development of healthy coping mechanisms, psychologically speaking. After all, why learn to solve problems in your life, when you can just get high and forget about them? I do, however, agree that grounding you, confiscating the stash and then smoking it himself, sends the wrong signal. I hope you'll learn from his example and become a better man. In the end, I hope all parents wish for their children to become better than themselves. Good luck, OP!

The difference being, he's not at the age where he can be grounded. Even softcore drugs aren't for kids dude