First Book

I just read a sentence saying: "You always remember your first book." So I started wondering about my first book and I don't know which it is. I remember a number of books from my childhood but my first one?
My mom read to my brothers and I as she tucked us in. She would start with me, the youngest. Each of us was allowed to decide the book she would read. I would lie in my bed, my mother would read and my brothers would sit by her, listening. She would kiss me goodnight, I would promptly get out of bed and go to the next room where my older brother would get tucked in and read his favourite story. My mom would kiss him goodnight, he would hop out of bed and we would go to my oldest brother's side where the same scenario would repeat itself. And then the young ones would scamper off to bed, our heads filled with bedtime stories and we would dream the night away...