I always find these stories incredibly amusing. My sister and I never fought, probably cause my mom would pull out one of these and spank us both if we ever fought
My mom was the epitome of fair, if we got into it we'd both get it, nobody was unscathed.
So we generally never fought. I did, however, always convince my sister to give me her candy when I was a kid. I had no self control and I'd always finish my candy way before her, so I'd always weasel her into giving me the rest of hers. Usually I'd tell her I'll give her mine next time, which never happened.