Someone's 15 year old brother is selling pot. What shall the older brother do?

Being of the non-judgemental type, the older brother is the only person the 15 year old trusts.

He tells of dreams of making 1000 dollars a month splitting it between him and his… partner…

The older brother doesn’t think it’s a good idea to let the young brother sell drugs.

Even consumption, which the older brother does now and then, he only started when he was not a minor anymore.

There is a certain imperative to stop this from going on further, if not for anything else, because it is easy money and a bad way of life to become used to.

But it’s important to maintain the trust from the brother.

For information, the 15 year old is repeating his 10th grade and is a very skilled grafitter… he’s kind of fond of the “marginal” adrenaline.

What courses of action could you recommend?

Thanks for everything.