Cinderella's Adopted Sister

Sure, everyone knows about my sister, Cinderella, but no one know's me. I was never mentioned. Cinderella had everything you need to be a princess. I guess I'll never compare.
You see, my adopted mother didn't think she could have anymore children after Cinderella. So she adopted me after my parents died in a fire. Thats the only reason our evil stepmother made Cinderella clean the cinders out of the fireplace, I wouldn't go anywhere near it. I'm not pretty, I'm not smart. I don't get a prince in the end. I get to stay and clean the cinders Cinderella left behind.