, and she currently has a person with an extensive criminal record (including child sexual abuse) living with her (because of this recent development, I haven't seen her in a while). She knows that these things are wrong (actually I'm not sure what she thinks about her bf) but she does it anyway, I'm not sure why though.
This is of great concern, more so than smoking in front of your kids or walking around barefoot. Do you think your friend would be taking steps to ensure the kids safety (like never leaving him alone with the kids)? I would be alerting the authorities over this.