You can file a motion to require the filing of the will. You would file that motion with the probate court in the county where your mother lived.
I agree with the previous answer. The Ohio statute indicates that the Will "must" be filed when someone dies, and the court can force that.
Additionally, once the Will is probated, if it is the one that took you and your son out of the Will, you can contest the validity of the Will that is filed. If successful in proving that she was not competent or she was unduly influenced at the time of the signing of the new Will, that will is thrown out and the older will (with you in it) is probated.
All of this would require you to hire a Probate attorney to undertake the filings and subsequent litigation.