Trying to build some long term relationships with some invests and expand my network to grow and take on more and more work.

For me the issues would be: 1) AirBnB might cease to exist.2) AirBnB might cease to be legal where you are.3) AirBnB involves having dozens of tenant relationships per month, instead of one every year or so.4) There have been some horror stories about people AirBnB'ing houses just to throw massive destructive parties. 

You don't want to be stuck with an empty house if something happens in your relationship with one of them.Sounds pretty exciting though!!!!

Also consider how it can impact your personal relationship with him and others in the family.

I've had a similar outlook with work and some personal relationships in the past.

You have to establish yourself as an expert and demonstrate that you know exactly what you’re doing including the market, cost, exit values etc. it’s more about you your competency and the relationship then it is the deal or the returns. 

It is Non-Exclusive because of my initial relationship with Fred. 

Some places offer mentorship programs for a percent of your commission, but I’m less inclined toward that type of relationship.

Ethical dilemma if you have been communicating with a buyers agent.To sum things up, if you are a newer investor and want to limit risk use a agent you have formed a relationship with.

If you can afford to front all the finances, you get to call the shots, including firing him if the relationship sours.