My two cents is that if you had a good experience with any professional by all means pass on their name (it's buyer beware -- people asking for referrals should know that it can go either way in starting a relationship with a referred professional), unless you know of something that's causing the professional's work product to slide.

Therefore, any offer price you make would include the realtors fees with the Owner and likely the leftovers that would have gone to the buyer's agent.  

They work with cash buyers only.  

My question is, as a wholesaler is it possible to construct such agreement whereas the cash buyer agrees that the son (a realtor) is the one who is able to list the property after the cash buyer has finished with the rehab.??

I have a question regarding lease option buyers.  

Then immediately contact all the cash buyers you just found that buy properties in that neighborhood and tell them about the house and would they be interested in buying it.

Also, If you have any free time please let me take you to lunch (on me) to discuss the neighborhood and dealing with rental properties or even if you need some assistance on your rental properties I would love the learn the basics and gain some experience (obviously no charge). 

I ask because although I've read that you can have success here and there with the MLS, it just seems to me it would be really hard considering the market exposure and then having to include, at minimum, the listing agent commission (assuming you could negotiate down the portion that would have normally gone to a buyer's agent).

Then immediately contact all the cash buyers you just found that buy properties in that neighborhood and tell them about the house and would they be interested in buying it.

The remodels normally take us about 6-8 weeks of rehab time, and then there's the usual 30 day escrow once a buyer wants it.