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There is no form for reporting interest paid on a private mortgage. Form 1099-INT is for reporting interest that the person received as income, not interest that they paid. Banks and other commercial lenders use Form 1098 to report mortgage interest paid, but you do not send a Form 1098 unless you are in the business of making mortgage loans. Your relative does not have to provide proof with their tax return for the mortgage interest deduction. They just report the amount on Schedule A line 8b, which is for home mortgage interest that was not reported on Form 1098. They do not have to provide proof unless the IRS asks for it. You can give them a simple statement of the amount of interest that they paid, in any format that you like, in case they get audited. Note that the relative cannot deduct the mortgage interest unless the loan is secured by the home and the mortgage agreement is recorded with the appropriate local or state government authority. See "Secured Debt" in IRS Publication 936, Home Mortgage Interest Deduction, for details. Did you sell the home to your relative, or just lend them the money to buy it? There are some additional requirements for reporting interest on a seller-financed loan.  

@Arble H Gimbleh ,  Now I understand your predicament --- you need all the transcripts of the returns filed ( as far as you can get ) and nay and all information filings   ( W-2, 1099s etc. ), in an effort to bring the filer into compliance. (a)    Since you already have a valid POA and assuming that you have the personal details of the taxpayer ( such as SSN etc. ), you can always go look at her personal account  ( or set one up ) and see what is there with the IRS  --- see this page -->  Transcript types for individuals and ways to order them | Internal Revenue Service (b)   you can also file form 4506-T for all the tax years that you need  or you can visit the local IRS office with the POA in hand  and seek guidance. I am saying the above because the taxpayer is alive, just not able to do the needful herself but you can set up  her personal; account ( if she has not done so herself) based on the valid POA. Once you have the details, I would  suggest starting with the latest years and work backwards ( since you have the TurboTax software for the needed years. Alsop note that while IRS ( and many states ) will allow refunds only for three years prior, the tax liability  for all the earlier years  ( with interest and penalty ) can go as far back as possible ( at least six years for sure). Also if she has not received any notices from the IRS ( that you are aware of ), then she either never filed or the informational filings were too small for the IRS to chase/ send notice to non-filing.  It is a difficult situation .   Good Luck