What should I do?

[Matter]

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I just found out that my big brother is a cocaine addict, I saw him using it in his room and he's going to school (but our parents think that he's going to school), I want to help him, I don't want to get ruined his life because of addiction. Should I tell it to my parents?

[postcd]

I think it is dangerous for him, so i think parents should know it. But they will be probably unable to stop him, professional help is needed.