How should I structure my RE investor partnership?

[Ben Gammon]

Hey Guys N Gals! 

So, my father and I are planning on investing in real estate together in Cincinnati. He is retired in California and is happy to get more money back on his return and help out me and eventually hand off some of his equity to my siblings. I have 9 years experience in property management and residential sales. My girlfriend and I will be moving to Cincinnati to pursue an MBA and want to buy a small multi-family. I have about $15K cash and could leverage at most $65K. However, I will not be able to qualify for a mortgage on my own. We are looking at multi families under $100K. The plan is for me to essentially be the manager of the managers on the ground. I will assist with demolition, manage rehab and manage on my own. My girlfriend will inevitably be pulled in for a fair amount of work (and she isn't afraid to do so) but she has no money to put in. My father and I agree that he and I should be the only ones with input for the direction of the property and others can have equity positions. However, he can sometimes be a bit of micromanager. For simplicity, assume a $80K 4plex with $40K rehab. 

My biggest concern is that I want to have at least a 50% say in the property in which I live in. 

How do you think my father and I should structure the partnership? 

     I've read about the 30/50/50 split and the 50/50 split 

How should my girlfriend be compensated? hourly rate? Given a minor equity position? 

If my father is going to gift some of his equity position to my siblings and I am going to manage the property, what is an easy way to do this? 

Sidenote: we almost put a bid in on a monster 29 unit building for $375K but decided not to because the numbers didn't quite pencil out. I was also a bit hesitant because I want to avoid becoming an employee. 

Thanks for your help everyone!