Since the money is a loan, you may be able to deduct the interest on the loan if you pay any. If you want to deduct the interest on your taxes, you need to write up some kind of amortization chart to document what you owe for interest. You would mark that you pay interest to a private party by amortization chart. The issue will be if your father has no EIN or SSN, then he could not receive the interest that he would need to report. He could possibly get a ITIN.
Whether the interest you pay is worth trying to figure all this out to deduct is up to you.
If you do, it can get complicated so check with a local attorney.
