I think you mean that your father received a Form 1099-INT reporting interest income in the name and social security number of your deceased mother, but it should have been in your and your sister's name. If so, you can report your share of the interest income by entering it in TurboTax as though you had received a Form 1099-INT reporting your share of the income, and your sister would to the same for her share.
You report interest income in the Interest and Dividend section in TurboTax, then look for Interest on a form 1099-INT. Choose the option to report the Form 1099-INT manually as opposed to downloading the information. Use the form your father received to determine what numbers go in what boxes.
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