Promm 😬

So my boyfriend wants me to go to prom with him. My family dislikes him because of the false information my older sister has told them. They're against us dating but I don't find anything wrong. I don't blame anyone for anything or how they feel about us. Should I go with him to prom? I need help. Prom is getting closer and I still haven't gave him an answer before he asks me with a poster and all. Please post your opinions and comments. I'd love to hear from you guys!