Gilbert Sr has already begun to carry out his plan on Francis Angel, but not on his wife, knowing full well how things are going.
He knows that if Francis falls, Lauren will flee to her mother in Canada, where she will be powerless, but he also knows that killing her will be the end of his generation.
He is well aware of how Lauren Angel's parents murdered his parents as a result of his father's poor decisions, which included having them kidnap Lauren at a young age without thinking about the consequences so that they might own 20% of the jewelry firm that is currently owned by her mother...