Lisa, Why not search for the State of Florida's website for requesting a death certificate? It has the dates that you were asking about and can answer many of your questions.
Have you contacted the Gadsden county clerk of the Court? They have the probate records, marriage records. Have you tried locating any genealogical society for this county? They should have some records that might help.
That should give you ideas for searching for your relatives, Good Hunting, Frank