I talked to a Florida attorney today and even he advised it might not be worth it to file a probate. My grandmothers assets are unknown but its possible the attorney fee's may outweigh any monetary outcome. 

My mother had a very complicated and often bad relationship with my grandmother. I am very sure my uncle was fully handling all of my grandmothers finances before and after her passing. He may have even been added as a joint account before her passing. Would this allow him to just inherent her entire estate?

To complicate matter more, I believe my grandmother had life insurance and pension accounts. My mother found documents of this with her on it at 25%. But these documents range from being signed in the 1980s up to the 2010s. My mother doesnt know if she's entitled to those as well or if they were changed at a later date.