Livia’s son was devastated by news of his father’s murder. He was a sensitive boy and whilst he’d never been that close to Terry, he was very much a mother’s boy. It was his grief that prompted a level guilt in Livia. Because of this she probably mollycoddled him a bit too much. And she leant on him about as much as he did her.
He would stay with her in their house for a couple of weeks. In so doing, he was inadvertently giving Livia the opportunity to play the hermit. Best that she didn’t see people, particularly Tony.