According to the instructions in IRS Publication 4681, In most cases, you don't have income from canceled debt if the debt is canceled as a gift, bequest, devise, or inheritance (see page 4).
This publication also includes the insolvency worksheet which may help to determine if the debt cancellation is taxable to the estate. As indicated by @ThomasM125 legal advice from an estate expert would be your best course of action.
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