Hi Susan,
My condolences also. What a mess this must be for you. I have to agree with Jim (noldar12) on this. I'm not from Florida, but my mother passed away in 07. My father felt he had to pay her debts off, so he did and he didn't have to. Mom had no estate. She left us enough money to bury her. The bills were in her name, they were her debts. You shouldn't have to pay the debts of someone else on your own, especially if you are not the executor. As bad as it is to say, it's Uncle Bill's problem unless there is a legal binding via attorney that he has appointed you the executor. It's not a matter of JUST a piece of paper that he signs...it has to happen with an attorney.
If it has happened that way, all medical bills are then up to you to pay if you decide you want to keep his condo. The smart thing to do is to liquidate Dad's assets so they pay the bills and it's done with. Whatever is left over debt wise if you fall short, you tell them to pound sand up their @sses if you sell everything and it still isn't enough to cover the bills. The estate pays the bills. When the estate is dissolved, it's game over for the people that are owed money too.
Don't let anyone scare you. They can't do a thing and are saying the same crap to the other 300,000 people that owe them money. I'd definitely not pay any of dad's bills though...they are not your bills to pay. Your best bet is to hire an attorney in Florida and pay a few bucks that way instead of paying the debts of your father. This way you'll be protected by someone that knows Florida law. Good luck Susan....and hey, though this is a sad topic, it is nice to see you back here. Wish you were still around like the old days. Take care.
-Danny