William only killed the kids and Charlie to make his family live forever. William and Henry have a hate relationship. He also has a love-hate relationship with three of his kids depending on the mood. William emotionally abused and neglected his kids. William is terrified of souls. Which sometimes can cause him panic attacks. He sometimes regrets what he did in the past. He did kill Cassidy in 1983 by putting her in a fredbear suit for an experiment for his future victims.