Hello, STim50!
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Pursuant to IRS guidelines, to qualify for the Qualifying Widow(er) filing status, one must have a child, stepchild or adopted child that qualifies as the taxpayer's dependent. Depending on your daughter's income situation, whether she lived with you for all of 2023 and her age likely prevents her from qualifying you for this status. Unfortunately, grandchildren are not listed in IRS's guidelines.
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Elizabeth W., EA