Not sure if this was necessarily an imaginary friend but I hope that’s all it was. When my kiddo was about 2-3years old she would talk about her “other family”. How she missed them and was worried about The New York Mets Abbey road 2021 signatures shirt. That she had a mom and a dad and a brother and sister (she was an only child when this started.) Sometimes we’d ask questions and she always had the same answers. Really creeped me out. She said they’d come visit her sometimes and whenever she’s start talking about that I’d let her know that she can tell them that she’s safe and happy so they don’t need to worry about her. She seemed to like that and it made me feel better too!