Mortgage note or cash?

[Jeff Lipple]

I'm a first time investor. I'm buying a property for 25k 7k cash 18k unsecured loan that I'll want to refi. I was told I should have the 18k paid by certified check coming from my parents so that I can start making payments to them as a mortgage on the property so that I can refi in 30 days where if I pay the full 25k myself I would have to wait a year to do a cash out refi. I know this is elementary just want some input or suggestions to make sure I set this deal up best way possible. Thanks!