A colleague passed this on to me. I know that some of the material is available from Safer Society Press but you can probably google the other resources.
Safer Society had a book on sibling incest "The brother/sister hurt" by
Vernon Wiehe, as well as a video "Why God, why me" which had a depiction
of a younger sister being molested by older brother and his friends.
Other books that have sibling abuse in them are:
"Voices in the Night" by Toni McNaron,
"Beyond Tears" by Lynn Tolson,
"Daddy's Apprentice" by Sandy Wilson,
"Bee + Jacky" by Carolyn Coman,
"I Never Told Anyone" -"My Brother' by Blanche Woodbury (poem on page
136-138) "Don't Tell Mommy" Rose Clayton
"Betrayal of Innocence" (Chapter 8- Sibling Incest) Susan Forward
"The Spirit Weeps" (Chapter 6) Tony Martens
"Fire of Five Hearts" (Chapter 6) Holly Smith
"No Secrets, No Lies" (Rahema's Story p97-101