I have always been an A+ student, and my little sister isnt. I am in grade 10, and she is in grade 6. My sister is at best a B student, but my mom cant deal with that. She always makes me help my sister with her homework and her projects. She lets my sister use the computer before me, which pretty much means I wont get to use it until it's really late. I have tried to explain over and over that my grade 10 work is more important than grade 6 work, and I need more time for my work. She just tells me a i'm a ***** and a terrible sister. I help my sister out until late, and dont get to go to sleep till about 12:00 - 1:00 on an average night because I stilll have all my work to do after my sisters. I told my mom that helping my sister is making me do worse, but she doesnt believe me because my grades havent dropped. This is only because I stay up the extra hours nearly killing myself because I dont want my grades to drop. Soon, i'm just going ot be too tired. What can I do?