Kevin mastered a dual persona. He was a cold, silent tormentor to Eva, but faked the role of a sweet, enthusiastic son in front of Franklin. Franklin remained in total denial, consistently making excuses for Kevin's behavior and blocking Eva's attempts to seek psychiatric therapy for him. : When his younger sister, Celia, was born, Kevin targeted her immediately. During childhood, he allegedly murdered her pet guinea pig and later tricked her into using drain cleaner as eye drops, leaving her permanently blind in one eye.