Sibs

From Author Wars - https://authorwars.com/publications/sibs-292891.html

Overview:

Title: Sibs
Author: F. Paul Wilson
Year: 1991
ISBN-10: 0685524728
Publisher: William Morrow
Price: $20.95
Pages:
Binding: Hardcover
Type: Novel
Title Reference: Sibs
Notes: Data from Amazon.com as of 2008-12-00.
No other evidence this exists