Charlotte Rodriguez: "......"
Alright, this option was absolutely impossible. Firstly, because Charlotte herself is a posthumous child, her biological father passed away before she was born. After giving birth to her, her mother also went through a sterilization surgery. Unless she was the Virgin Mary conceived by divine intervention, it's unlikely to have a sister appear out of thin air.
Her real name wasn't Charlotte Rodriguez either; her true name is Roxanne Martinez, and Charlotte Rodriguez is just her stage name. But since she has been called Charlotte for so many years, she never changed her name back. That's why it created this illusion of having a "long-lost sister."