I couldn't take the secrecy anymore. I sat Ferb down and had a talk with him about Mrs. W. He understands that the police will question him. He listened to me about her and her "issues". He doesn't fully grasp how pitifully sick this woman is, but that is due to his age. He is ready to end the relationship with her, but he feels he cannot do it at this moment because she is in a bad place in life. (I bit my tongue hard on that. Stupid sick woman.) She has lost her job even though the news did not report it. She has lost her marriage. She is facing prison time. She is suicidal. Ferb is not. He seems resolute that he is not going to abandon her at this juncture. Basically, he is behaving more like an adult and she is more like a child. He understood why I did not want her at my house and agree to abide by rule. He knows the neighbors are watching. We had a very honest and calm talk and I am no longer worried about his mental health. I still hate that he is sucked into this sick woman's drama. And yes we discussed at length how warped her choices have been. I made a point of explaining how she has lied to everyone in her life. He thinks he is the "only one," but I made him stop and think about her husband. I told him I thought that other boys are involved.