This is not true. If you are the beneficial owner of the property than you can qualify to take the tax deduction for the interest paid on the home loan.
Pursuant to IRS Regulation Section 1.163-1(b) you are allowed to deduct otherwise deductible interest you pay on a loan secured by a mortgage on property you own even if your are not otherwise liable on the note.
Let me know if you have any question.
Please note: This advice is provided with the understanding that all the relevant facts have been provided by you. Any change in facts might affect the advice given and hence may not be relied on in such cases. Nothing contained in this reply was intended or written to be used, can be used by any taxpayer, or may be relied upon or used by any taxpayer for the purposes of avoiding penalties that may be imposed on the taxpayer under the Internal Revenue Code of 1986, as amended.
You do not have to submit any other documentation with the tax return. You can keep it in your tax file. Since you are on the title of the property, the deduction is a valid one. It will not trigger an audit or inquiry.