Anyone have experience with a renter who is depressed, diabetic amputee and not taking care of himself?

If he was a wartime veteran, call the VA

We had a tenant (renter) many years ago who was almost like that, unemployed, depressed and not taking care of himself. He came to us because he needed somewhere to stay. The condition we took him in, was that he find himself a job. End of story - he didn't find a job, I was expecting our 1st baby. He was dropped off at a place, where people were taken in, who had no-where to live. He was warned, but didn't try to help himself.
Yes, call social services and see if they can sort out this guy. If he doesn't help himself, who will? All the best.

Yes. Call social services. Not to tattle on the son but to protect a vulnerable adult. Sounds like he needs some medical care and some encouragement to take care of himself or placement where he can be cared for.