Quote SamiBrady_Chelsea: Well I think he might harm his own daughter...Lexi hasn't exactly held up to the Dimera name...she saves people (being a doctor) she certainly doesn'y plot scheme and kill people ( a true dimera)
Even if Lexi does not seem to follow in Daddy's footsteps, she STILL is his daughter. His ONLY living girl. As a matter of fact, the only thing about Alexandra that DISPLEASES her father is who she choose as her husband. Other than that, Stefano is thrilled at what Lexie does. If my memory is correct.
Regardless, Stefano is not willing to risk HIS family's -read children and grand chilren's- life (lives).
Steffie might be ruthless and evil but family is IMPORTANT to him. He will not purposely endanger the life of his only livng daughter and that life of her son's. His grandson who can be "molded" to take over in the family legacy.