What should I do about my creepy perverted brother?

Anonymous
Hi my name is Joy, I'm 16 years old and my brother Drew, who is 16 years old (four months older than me) and will be 17 in June, is a pervert. He stole me and my sister Kat's underwear, he touched me and my younger sister Emma, who is 13, while we were sleeping in the car, he snuck into my other Kat's room in the middle of the night with night vision goggles, looking through her dirty clothes and his excuse is that he wanted to ask her something, and I caught him coming out of my room and his excuse was he was look for something that he thought I stole ( which is a lie). He sometimes stares at our butts and boobs and he says inapropriate things to us. Sometimes I want to kill him, so he won't do this to anyone else, but I know that wouldn't be the christian thing to do and I hate when he calls himself a christian and sings christian songs when he does all this crap. Can you guys please help?
Updates
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My parents do know about this but they say its family business
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The reason I want your opinion is because my sister who has 10 kids, 1 boy and 9 girls ( 6 of them are under 12), and her family are coming over on the end of May and I know I can't keep an eye on him all the time, but I just don't trust him around any little kids.
What should I do about my creepy perverted brother?
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