Hi Eddison. Sorry to hear you are going through this. Addicts will lie until they are blue in the face about their addiction. The number one goal of an addict is to continue to do drugs without any interference from loved ones. But they won't tell you that. They will tell you they quit, they want to get clean, etc. etc etc.
The best thing that people who love addicts can do is draw boundaries about the kind of behavior that is acceptable in their lives (and in your case they kind of behavior that is acceptable around your children), and they if someone is violating those boundaries, follow through on what you need to do.
In my case. I had to leave to protect myself and my son. I do not want my son to think that drug use is acceptable behavior.
Good luck to you. Keep us posted.