You should file an amended 2020 Form 1041 and include the interest and the legal fees. You do not file a personal tax return (Form 1040) to report income received after death. Another option would be to report the interest income on your personal tax return (if there are other heirs, you would split it). You wouldn't be able to deduct the legal fees. The former is the correct way (amended 1041), the later a CYA way to ensure the income is reported.
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