This brings back memories. I Know This Much... was the first adult fiction novel I ever read. I was 16-years old and I was actually proud of myself for finishing this huge book and understanding it all along the way. I'm an only child (well, technically I have half-siblings but they don't count lol), and this book made me feel both relieved and disappointed that I didn't grow up with a brother or sister. I remember being okay with how everything unfolded and ended, but I didn't feel I had a better understanding of mental illness and schizophrenia when it was all said and done.