Unique situation (help with funding)

[Cory Trahan]

I am rehabbing a home who's owner is related to my wife. Me and my wife are going to rehab the home and when sold the home owners will get 80,000 (to pay off their mortgage) and we will receive the rest of the profit. We are only wanting to borrow $25,000 to rehab. My question is what should I use as a capital source? I would assume this would be a construction loan, but I do not own the house (no collateral). Should I try a bank loan or HML? I don't know what option to try for. This is our first flip and I know it is an unorthodox situation. Me and my wife have great credit above 750 and was wondering if anyone has had a situation similar or know where to get capital for this situation.

Thank You for any comments and advise.