You did an installment sale. To report the sale, see What is IRS Form 6252: Installment Sale Income. You will record the basis of the house as the value on the date of death. You must report sale to a family member.
You will each report the interest on your return. You will report the interest earned on Sch B - as if you received a 1099-INT.
Your son will report the interest in the mortgage section with your name and social as the mortgage holder.
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