You could ask your financial institution to reissue you a Form 1099INT with your SSN on it since you are also on the account.
I would not add it to your 1099-INT because then it will not match the information that is reported to the IRS.
Reporting it as described above as "Other Income" would also be appropriate. It is not a large amount and you are also already on the account.
Label it as interest income from your deceased mother, her SSN and state that you are on the account as well.
Click here for detailed information on taxes when there is a death in the family.
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