Facebook????????? need your help?

Hello, im still in with my parents and i reallly want a facebook, my parents wont let me have one, and if i make one without telling them, theyll fined out so i dont want go make one anyway answers. Does anyone have something to say that i can say to let me get one, plus i have asked her hundreds of time so please think of something unique. p.s. my mom has one!:(