I smelled alcohol on their breath during their visit so the "I have mental health issues" could be some substance abuse.

He openly admits to being an alcoholic, but says his recovery is struggling after being laid off and because of the pandemic.

@Cole FleishourDoctors or not, I know some who are on drugs and alcoholics, they are human like anyone else.If they have violated at least two items of your lease agreement.

At minimum, (1) any criminal drug activity or (2) other criminal activity or drug and alcohol abuse that threatens the health and safety of the residents or staff or hinders the peaceful enjoyment of the housing premises, is intolerable.

have a physical or mental disability that substantially limits one or more major life activities—including, but not limited to, hearing, mobility and visual impairments; chronic alcoholism (but only if it is being addressed through a recovery program); mental illness; mental retardation; being HIV-positive, having AIDS or AIDS-Related Complex

There are different levels of crazy who cannot take care of themselves, criminals who earn sporadic low income from violent crimes and reselling drugs and fake drugs and tainted drugs, those who's personalities will never let them hold a job for very long, the low IQ who cannot be expected to earn very much from their efforts, the workshy lifelong generational loafers, those down on their luck at the moment and the hardcore alcoholics and drug addicts (plus probably more types).Since they are not a monolith, a monolith solution will not solve the problem. 

There is also a house inspection to pass (which mainly deals with where they store knifes, meds, alcohol, etc.) but if any of the children are handicapped, does the home have to be accessible? 

If he was an alcoholic, I would probably assume it was drunk rambling.

Alcohol is expensive and damages your body / brain. 

TN also has ordered that bars can be kept open and gave a special order that alcohol based drinks may be picked up from the bars and taken home from the bars in cups with lids.