As Elise was trying to absorb the same person the creature had mentioned was Caleb, she knew she should hurry and tell her grandfather and father about the demon's appearance. Truth to be said, Elise couldn't see Caleb as an enemy. From Ian's memories, she could tell that although the demon had spend less time with her husband, they had bonded over the pain they only both of them understood at the time.
Caleb appeared to be a person who would protect his promise and treasure the small relationship with respect. However, the ultimate problem wasn't Caleb. It was the man who was behind all of this, Ernest.