Florida law; Step Father w/ Clinical Depression

First a little family tree history. My biological mother married "DAD". He is not my real father and he never legally adopted me. But for the past 21 years he has been my "DAD". My mother and "DAD" have since divorced due mainly to his condition. "DAD" has remarried a much younger woman, (possible gold digger), although there is not much more than his insurance to dig for.

Since his marriage 2 years ago his condition has gotten much worse. He has become heavily dependent on Drugs, he is incoherent most of the day and for the other part of the day he sleeps. I cannot get any information from his new wife or his doctors. I am afraid if this goes on for two much longer he will die from all the drugs he is taking.

I need to know what I can do legally. Im not sure if I would be right morally to have him commited but if that is what it takes to help save him from himself then I am prepared to make that decision.

Please help me Law or opinion I need answers. I talked to him on the phone today and he didn't know who I was.