Creating a Win-Win for Family Investors?

[Charlie Swain]

I'm just starting. Haven't closed on my first deal yet but actively looking everyday. Looking at Flipping or BRRRR strategy.

Thankfully I have two family members willing to invest some big money to help me get this thing rolling. One at $200k  and another at $100k.   I want to do well by them since they are taking the risk and they are family.  But I also want it to be best for me too.   

How would you suggest I structure a deal?   Should they get a percentage of what I borrow regardless of the deals or should they get a percentage when the deal is complete?  Looking for good suggestions.  Thanks!