Should I tell my dad?

My brother ( 14, soon 15 ) smokes, vapes and uses snuff and my dad doesn’t know because he would be pissed off if he did it. So he hasn’t told him, but my mom knows. He is getting a car soon even though he can’t take the driving test yet.

We were supposed to go on vacation with my cousin but instead he is getting that car for the money.

I want to tell my dad to bust his ass because he is always an asshole to me and I want to give him karma and I really want to go on a vacation. My mom thinks that it would be really mean and she thinks I shouldn’t to it. What do you think??

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