I have found an author who can describe sibling loss better than I because she has lived through it. She has a website at http://devitaraeburn.com/ where you can read more about her and the reasons behind her book. Sibling grief is gut wrenching pain that no one can easily describe. I would recommend this book for a better understanding of sibling grief, first hand.
The Empty Room: Surviving the Loss of a Brother or Sister at Any Age
By Elizabeth DeVita-Raeburn
The Empty Room is the story of my life with Ted, my older brother and best friend. On a September morning when I was six, I woke up--and Ted was gone. He would spend the next eight years isolated beyond a clear, plastic curtain in a bubble room, where I could see him, talk to him, but because of the risk of infection, never touch him.
I have interwoven my story with the stories of many others who have lost brothers or sisters. Before I found them, many had never had the chance to speak of their loss. The Empty Room recounts their stories, and mine, giving all of us a way to reclaim our lost brothers and sisters.
Visit her website to purchase a copy of the book or get one from your local book store or library. You will gain a better understanding of sibling grief and the depth from which it penetrates