I Know This Much Is True is written by Wally Lamb
[Human]: Could you recommend books similar to I Know This Much Is True? [Assistant]: I Know This Much Is True is a Fiction Novel written by Wally Lamb. Do you like fiction novels? [Human]: I love fiction, young adult fiction and fantasy books! [Assistant]: There is We Are Water by the same author, you might love this one as well! [Human]: Ive never read that before! Im going to look into that book right now! Thanks for the help and recommendation! 
Enjoy your reading time!