Structuring a Deal to be mutually beneficial

[Kate Batten]

Hello! I’m hoping to crowd source some ideas on potential deal options. I’d love your thoughts:

Background: my brother has been renting a house from my father. He has wanted to buy it for years but doesn’t have steady W2 income (he’s a fishing guide in Montana and has another winter job) but his wife does. They don’t have quite enough for a downpayment and don’t fully qualify for a loan right now. I’d love to help them, and make it a beneficial deal for us both. Thoughts I had:

Price: $250000, could sell for over twice this given the location but my Dad wants to give him a deal

Location: college town in MT-highly desirable area

Split the down payment and co-sign the loan. They pay the mortgage and over time, pay the loaned downpayment back with interest. And go 40-60 on any profits should they sell down the road. 

What other ways could we structure this where it makes financial sense to me (not trying to make a ton, just enough to recoup costs and get me a better return than a bank) and helps them by getting this house? What creative ways would you suggest? 

Thanks in advance!