I am an attorney. There is NO SUCH THING as an ORAL WILL. In every jurisdiction in the US a will MUST BE in writing. Period. No exceptions.
Also, if there was no written will, every state has a statute protecting the living spouse and children. Depending on how many children there are, the spouse will generally get 50% to 1/3 of the estate and the remainder will go to the children. Every state is different though.
I would start by looking at the original probate proceedings and see what the hell happened. I would also consult an attorney ASAP if you have a significant monetary stake in the matter. If you wait you will get screwed.