Each state's Probate rules allow a creditor's claim period - AFTER which all claims are permanently barred. Once notice has been given and published in the paper, the clock is ticking. Sit down with an attorney who understands those rules. See 'Find-A-Lawyer' tab at the top of this page.
My answer is based on the limited facts presented. It doesn’t create an attorney-client relationship. Use the ‘Find-A-Lawyer’ search engine at the top of this page and follow proper legal advice.