What if he had bought it to split with his older brother, and he just hasn't had time to see/ smoke it yet?
If it was half his, and half someone elses,i hope the oldr bro looks at it, finds out it isn't weed, and busts a cap (or 5) in your ass.
Also people don't seem to be noticing the fact that it's $100, even now at 16 years old $100 (£60ish) is still a fucking lot of money, and would do you some real damage if you took it from me...
So move house, and stay off the streets