To my Dad...
You haven't got ME, you have sleep apnea and you're an alcoholic and you are 83. If perhaps you'd spent more of the last 80 years sleeping properly and not drinking, you might feel less shit and actually have some semblance of a life.
No one comes to see you because you have, for the last 30 years at least, used 'being old' as an excuse to be unrelentingly vile to everyone around you to the point that you are barely tolerated in the pub and only then out of pity, and none of your remaining friends wants to spend time with you.
Your daughters are stressed out dealing with their own stuff, one is in fact too disabled to visit you in your thoroughly inaccessible home but you refuse to be driven to hers, the other is breaking under the strain of managing her own terrifying life limiting health condition and neither of us want to let you know how serious things are because you'll just use it as an excuse to wallow in misery, or shout at us and tell us how you don't want to hear it because its depressing.
We don't ring you for a chat because you have zero interest in listening to anyone else and as you sleep all day and go to the pub for two hours every night simply to get pissed and call people a cunt, you have nothing to actually say, and in any case, you just grunt at us and then hang up after a minute or so.
Also, you're not funny. You have never been funny. Your idea of humour is to pick on the vulnerable and anyone you deem lesser than yourself. If people have laughed, it has been out of discomfort and awkwardness, or fear that if they don't they'll be your next target. Most people are squirming and trying to change the subject, not that you have ever noticed.
...
There is no point though, and never has been. None of the above is dementia (though I think that is now a factor), it hasn't been most of his life and he has been like this all his life from what I can make out!