The Giant Pumpkin Suite by Melanie Heuiser Hill

Rose, a twelve year old gifted mathematician and musician, practices her cello diligently in hopes of winning the Bach Cello Suites Competition.  Her twin brother (who is a lot shorter than she is and in a few grades behind her) has different goals for the summer-helping Rose loosen up and have fun and to grow a pumpkin with their neighbor Mr. Pickering.  A couple of serious accidents occur which change the course of the summer.

A touching story of community and how being mended can make one even more beautiful.  We are all broken people.  In the broken places we can grow the best. 
I really liked the diverse array of cultures represented in this book (Japanese, Spanish). 

Warnings/points to consider and discuss: Two men,  Jeff and Simon, are a couple and have a baby boy. Although they are not major characters compared to the other neighbors, they are part of the story and show up a few times.  Mrs. Lukashenko is big chested and her big "bazooms" are mentioned a few times-even her heaving them onto the desk to rest! The Jacobi's father is a con man and resides mostly in jail. The prominent characters in the story do not have any fathers. The mothers need to work two jobs to make ends meet.  There are many great characters who are men but no fathers (except  Jeff and Simon).