You'd treat it just like it was another mortgage.
In Turbo Tax Deluxe:
1. Sign in to Turbo Tax.
2. Go to Deductions & Credits.
3. Select I'll choose what I work on.
4. Go to Your Home.
5. Click Start or Update by Mortgage Interest, Refinancing, and Insurance.
6. Type your Lender Name when you get to that screen.
7. Enter your info on Let's get the details from your 1098 now. Click What if I don’t have my 1098? on that page if you have more questions.
8. Continue through till you get back to the Deductions & Credits menu.