Looking to buy first rental house with cash, need advice.

[Jon Simmons]

I have a family member that is willing to fund the purchase of my first rental house with cash. They basically want to help me get started and are not looking for a return, just their original investment back. What would the best pay back structure be for this? Would it be better to take any positive cash flow and put towards paying them off faster or saving the cash flow for a second unit?  With my situation, what would be the best way to go from one unit to two units and etc? I would like to take advantage of the opportunity and acquire multiple units when possible. Thank you for any adivice!