I am a divorced father of 3 ( 10yo boy, 9yo girl ,5yo girl ). My ex-wife started hanging around a neighborhood family about 3 months ago. They have a 15yo boy, and 14 yo girl in high school. This family is at my ex's house every single day and night. The mom is there every night smoking and watching TV with my ex. The kids spend every weekend and holiday with this family, and not much time with friends their own age. My 9 yo talks non-stop about her friend who is in high school. There was also an incident in which my son came to me with. This 15 yo high school boy was talking to him about restraining and doing sexual things to some girl. I talked to my son about it, and told my ex I was concerned. After I voiced concern to his mother, my son said he made a mistake and the kid didnt really say it. I asked where he heard it then, and he has no answer. I am concerned about the safety of my kids, and the fact that the ex seems more concerned about her friendship with this women than her kids. She now tells me they are good people, and have a "family relationship" with her and my kids. This seems like an awfully FAST and somewhat strange relationship. Do I have right to be concerned?