Agree with the others. Pot is very noticeable, it makes clothes and hair reek, cars reek, etc. I was sitting in a bar in Oregon, and some people walked in and sat 15 feet away from me down the bar and the odor of pot was really noticeable. I don't think people who use it realize how strong it smells.

So...try to keep a low profile and just put it down, it's not as hard as stopping other drugs or even alcohol or cigarettes (trust me on that one). Nobody's saying you are a bad parent. Sorry you are having a hard time with a relative but don't give them ammo.