Sisters High School Over Load Her Fault?

My sister was always complaining about her work load. Well, I'm in high school now and you know what I think? It's her fault. I always spend whatever time I get doing my homework, my experiences lead me to believe that she didn't use that time. She always had so much homework to do even in middle school and I have never! had that problem... Everyone thinks that I don't do my homework or something but thats not true! I always do my homework but I do it in class every spare moment I get. I hate having homework I like to come home and relax after a long and hard day. She never had to do any house work during her school years either she would just say,"I have homework" and I would have to do all the work. I still do all of the work. She can do what ever she pleases when its something fun but when its work she's too tired, her back hurts, or she has work to do. She also over achieved, she should have loosened up and had some fun a report card with all A's and B's are just fine with me. So I say her overload is her own fault!