Happy birthday, Caitlin. You are a more wonderful daughter and friend than I ever dreamed God would send to me, and while you may only be 13, already "so much of me is made of what I learned from you." I know that "you'll be with me like a handprint on my heart" because "whatever way our stories end . . . you have rewritten mine by being my friend." Thank you for being in my life, sweetie. "Because I knew you, I have been changed for good."