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Since your parents are the principal borrowers on the loan, they are the ones who receive the 1098 at the end of the year and therefore are the ones responsible for claiming anything related to the mortgage on their own 1040s. Since you're a co-borrower, you cannot claim any deductions at the end of the tax year because you didn't take on the mortgage as a principal borrower. If you want some peace of mind, you can always call the lienholder and ask. Hope that helps.