dreaming of a place that doesn't exist

sometimes when i fall into a deep sleep, i start to wonder off to a place that no longer exists, only in my mind. it is my old home with my biological parents. the dream starts off feeling so real, i can smell the cooking my mother was making, it smelled like breakfast, those kind of breakfasts you have on Sunday mornings. I walk around my house, and end up in my fathers room, he is painting like usual. I ask him what he is painting, and he tells me it is the landscape of one part of our community it was surrounded by stars and northern lights. Mom calls us for breakfast and we sit around our dinner table just the three of us. I start to wonder where my older sister was, but then I remember she is no longer living with us because she didn't want to face my parents. They used to hurt her a lot and favorited me, I felt extremely bad for her because she was only a teenager. Every so often I keep dreaming this same dream that I am with my family, but when I wake up I'm sad again.