Since you gave me the most comprehensive answer, in your professional would you think I have a descent chance at going through with this legal matter?

The key part of my answer was the list of things that you don't know and need to find out. There is no way to know if you have any sort of claim until you find out how the busienss is owned, whether there was a will, and whether the will was probated. If the answers to these questions come out one way you have a case. If the asnwers come out another way, you have nothing.

For instance, if the business was jointly owed by your father and uncle and our father's will provided that the uncle would inherit the business - then you have nothing. If the buisness was owned by your uncle and your father just worked in the business for a salary, then you have nothing. If the business had more debts than assets, then you likely have nothing. If the business was valuable and your father owned all the stock and he died without a will, then you likely have a significant interest in the business that is worth pursuing.