You can not bring this action on your own and hope to be successful. You need to retain estate/probate counsel to do this correctly and maximize your chances of success. It sounds like your position has merit but get counsel to assist you.
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Of course you can file a Caveat in this case to determine the validity of the Will. You should, however, seek counsel in doing so. Proving duress, incapacity, or undue influence is a complex and very challenging procedure.
Disclaimer: This answer does not create an attorney-client relationship, it does not constitute legal advice, and it should not be relied upon as such. Laws vary from state to state, and an attorney cannot fully evaluate your situation without a comprehensive consultation and review of all facts and information readily available.