My(M36) wife(F29) is refusing to come back until the “problem” is fixed. She would be referring to my son.

My wife has been gone for about a week now. She took our 2 kids to her parents house and plans to remain there until she feels like our home is safe to live! in. Last week, our daughter went into my oldest son's room and recovered a g*n. I was not home at the time, but my wife told me that when she had went in my son's room to get my daughter, she had found her holding it. She was hysterical on the phone, and by the time I got home she was already one foot out the door with our son in one hand and a suitcase in the other.

I don't even know where the fuck my son got it in the first place, and he wont budge. I seriously don't know what the next step is here. For the past year, he is unwilling to cooperate with anything I'm trying to do to find out what is going on. My son is extremely distant and that crowd that he has been with really concerns me. He had a great group of friends, but one by one they started dropping until he was completely emerged with his friends now. Constant law-breaking, skipping school, selling drugs and all this other stuff that I can't even get through to him about.

I have one final option, but I've been pushing off on doing this, but I truly believe that I've run out of ideas. For him to go to online with his mom in another country, but again, I don't want to do this because I don't want him to feel like I've just abandoned him. I've tried talking to him, psychiatrists, multiple therapists, etc., but absolutely nothing. It only gets worse as time goes by. I thought this would be his rock bottom, finding out that his little sister could've almost died due to his negligence, but no. He lies, denies, and then refuses to answer my questions. I have worked remotely this whole week to ensure he's in the house, but he refuses to do so. I just want to figure out what's going on, but it feels like all my attempts at it are feeling. Please, what I'm looking for are any more suggestions on how to get through to him?