How do you tell your parents your sibling is doing drugs?

Hyped_up_on_coffee
Well my sister is a pothead I wouldn't have as much as a problem about it if she wasn't such a bitch with everyone. Mom suspects her at times and she is kind of in denial and is in shock because she doesn't want to think she is a bad parent. My dad is in denial because she throws tantrums about how they should trust her and let her do more stuff and thinks my mom is over exaggerating. Even though they found her bowl and decided to believe it was a friend's.

I'm just overwhelmed by the whole thing and sick of her tantrums and I know its not going to be pretty. Any help or advice ?

Updates
+1 y
I'm not blaming her actions on weed , and its not out of spite and I know weed isn't that addictive. And you don't understand these are very conservative Hispanic parents
Updates
+1 y
Well I told them and on the same day a friends mom busted her out on it so ... um thanks
How do you tell your parents your sibling is doing drugs?
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