How should I charge my investor in a wholesale transaction?

[Lee Pham]

Hi everyone! 

I am a Broker in the Seattle area and have a question regarding how I should approach working with a local investor. My cousins husband has recently approached me and has asked that I research and find off market deals for him to fix and flip (he owns a contracting company). He will be listing all future properties with me and I of course want to be as transparent with him as possible. This question mainly has to do with my compensation. What is generally fair to charge an investor that you have a relationship with? Of course I want to make money but who should I go about it when finding off market deals? I hope the question made sense!