My little sister doesn’t seem to know that she’s fictional

My older brother and I, along with our two of my younger siblings, live in a cozy two-story house with a basement, and a large backyard. My sister and I share the same parents, but in a way, we’re all adopted. We were made up by her, and the world we live in, is just one of her ideas.<br><br>My sister’s passion project is worldbuilding. Whenever she isn’t stuck in school or busy with exams, she spends almost 100% of her spare time creating new worlds. Most of them are based on fantasy or science fiction universes and feature magical powers, aliens, war, and other exciting stuff. <br><br>She writes stories, draws maps, creates the histories of entire nations, and even documents the entire ecosystems of fictional planets. She loves her hobbies and I don’t mind them. In fact, I find it very entertaining to read her stories and learn about her worlds. <br><br>So all in all, she’s a very creative person, who seems to know no limits when it comes to imagination. She also has a lot of different hobbies and passions. But what’s really odd is her relationship to her imaginary family. <br><br>She often talks to my parents, just like she would in real life. She tells them about her day and about what happened in school. At night, she kisses them good night, and in the morning, she hugs them good morning. When she’s in a good mood, she even cooks breakfast or dinner for them, and then eats it alone, talking to them as if they were there.<br><br>My brother and I also notice that she often talks to us. She tells me stupid jokes or confides in me about problems she has with the other kids at school. As far as I can tell, she’s never really been sad in her life, but whenever she is, she talks about it to me, and I just listen to her, since I don’t know what else to do. While we’re alone in her room, she also lets me read pages from her journal, or shows me her drawings and paintings. <br><br>I don’t think she’s ever been in love, but whenever she’s in a good mood, she will often hug my brother, and sometimes my younger sister. She even kisses them on the cheek. We don’t really know each other, but we tolerate each other, since we all live in the same house. But we do know that we’re her favorite children, and that she loves us. <br><br>I don’t know, why she’s so attached to her imaginary family, but it seems like she can’t imagine living without us. And I don’t think she ever will. She’s far too attached to her make-believe world.