What do I do for an alcoholic son in a downward spiral?

alcohol

#1

My son has a beautiful/loving wife, adult son, and a daughter enrolled in college. He had a terrific, well-paying job but lost it when he showed up with alcohol on his breath. He refused to go to re-hab to keep the job, so was placed on paid administrative leave. Now his unemployment benefits have elapsed and yet he continues to drink. He quit drinking a month ago and sounded terrific, then he began taking Ambien to help him sleep. He’s since started back drinking again with the Ambien and has really gone downhill since. My daughter-in-law says he’s acting crazy and she’s very frightened. He is a gun collector and frankly I’m scared that something bad will happen to his family or him. Please tell me what I can do besides telling his family to call 911 if they feel endangered?