for Edward's Eyes by Patricia MacLachlan
Jake is part of an extraordinary family. He leads a life filled with art, music and hours and days and months of baseball. But the most important person in his life is his brother, Edward. From the moment he was born, Edward had the ability to make anyone laugh and everyone think. During one special year he was the only kid in the neighbourhood who could throw a perfect knuckleball - a pitch you just could not hit. But that same year, Jake learns that there are some things you just can't hold on to.
Publisher description retrieved from Google Books.