What can I do about an alcoholic son responsible for his 92 yr. old mother in declining health?

Is your Dad the PoA for your grandma? If not, he has no legal authority over her. In this case you may choose to contact a social worker to get her/them on the radar of social services or APS. If he is endangering her then the county may move to attain guardianship. I found working with the county social workers was an very good experience in the case of my own in-laws.

I think with your own health issues & panic disorder, the last thing you need is to be worrying about your father AND your grandmother, and/or getting guardianship for either one of them, personally. In reality, your grandmother is your father's problem to handle as he sees fit. He needs to hire an aide to come in and shower her once you tell him NO dad, I cannot possibly shower grandma any longer, I'm way too busy. Send him a link to Care.com or the name of a local agency where he can hire someone to come into their condo to help grandma out. Tell him you won't drop what you're doing, either, and come over to fix her TV set. There's a great service here where I live called The Handyman Connection. Look on Google in your area and text dad with a similar service who he can call to help HIM out with things he can't be bothered doing himself. Booze comes first in his life, after all, so his mother comes second. You can't go over there and tend to matters that are HIS responsibility b/c it puts you into panic mode, and that just exacerbates the issue, so don't do that to yourself. Set down some firm boundaries with the man, letting him know what you're no longer willing to do for grandma and what he MUST step up to the plate to provide for her (in terms of care); grandma can pay for those services, of course, but dad has to set them up and allow the CGs to come into the home.

If grandma is exhibiting signs of dementia, she would no longer fare well in an independent living apartment and would do much better in Assisted Living with a Memory Care annex IF she has the money to private pay. You could always suggest that arrangement to your father over the phone if you think he'd be amenable to such a thing. Otherwise, your hands are tied really b/c this is his mother you're dealing with and he probably has POA for her.

Come here to vent anytime, and/or to ask for advice. Many people are in the same boat you're in so you're bound to get some counsel from people you can relate to.

Wishing you the best of luck with a tough situation.

You can report the situation to APS and if they find during an investigation that either one is unsafe they will step in. Or your State has an Elder Abuse hotline that you can report the situation to.
You could try to file for Guardianship for your Grandma. At least if you are her Guardian she will be safe(r). At that point you can move her to a Memory Care facility that will be able to care for her 24/7 as she declines.
I suppose at some point you will also have to deal with your father as well and finding care for him as well. (get one thing taken care of first)