But I am unsure of how to include my siblings and protect the investments that I put into the property at the same time.

I'm self managing so I factor in zero for that. 

In central Alabama the following areas are good.Hoover, Pelham, Calera, Alabaster, Helena, McCalla, Gardendale , Trussville just to name a few.More affordable low income areas will include Centerpoint, Pinson, Hueytown, Pleasant Grove, Ensley.  

The story: My Grandparents (the trustor) made a trust and included their 4 sons as the beneficiaries of the trust.

My question is...how much should I allocate/factor in for Cap x and monthly maintenance on a new construction?

@Dennis Guinto, one other factor if you are wanting to sell your other property and do a 1031 to buy your father's property is that would be a related party transaction. 

Included information about repairs, expenses, and collection data from the past 4 months. 

Of course, remember that you can include any major rehab or upgrades you've done in your tax basis.

Personally Tyler is one city I would love to get involved in the future as they have good numbers on population growth, unemployment, income and rent growth.Other examples of landlord friendly states include TX, AL, FL, AZ, and OH.

Financing OptionsAnalyze potential properties for house hacking.Assemble a team of professionals, including a real estate agent, mortgage broker, and possibly a property manager.