A childhood belief about family

When I was younger, my older sister was a tyrant who always got in trouble. When things went awry or if I got hurt, my parents would often ask, "Did she do that?", probably gesturing to my older sister. I hadn't a firm grasp on pronouns at that point, so for the longest time I thought my sister's name was "She" and would talk to her or about her referring to her as such. We didn't put it all together until years later, why I would call my sister "She", rather than her given name.