Request #408 From tesswaxman

Hi! Can you help me find my favorite book from when I was 9 and 10 years old? I’m guessing this was published in the late 90’s or early 00’s but could be wrong. It has a periwinkle paperback cover and a a short middle reader novel about a girl who moves to live with her grandma (and grandpa?) in a small town for a summer. This is where her single mother grew up. She stays in her mom’s childhood bedroom and reads her diaries. One day, she meets a 7yo boy in the woods behind her grandma’s house. She later finds out he has leukemia, and he’s her half brother. She gets to know her dad, and there’s also a plot line about a romance with some boy she meets outside church. Eventually, she donates her blood marrow to her half brother (I think his name is Jamie). I’ve googled to no end and cannot find the name of this book anywhere!! Any suggestions are helpful.