How can I structure this deal

[Freddy Lleren]

Hello Group, I own a property that I have decided to sell. Tenants moved out and the house needs some work. The contractor is a relative that brought me the deal and they want to participate on the flip. Essentially, they want to take care of the rehab and share part of the profit once we sell. How would you structure this deal? What contracts will you use? 

Help and suggestions will be appreciated. Thank you